I have a composite control which consists of label, linkbutton & textbox control. Depending on the display mode (a property within the control) one of the control gets displayed. However when the linkbutton is clicked it seems to throw up this error. The control
works fine in .NET 1.1.
The control inherits from System.Web.UI.WebControls.WebControl, IPostBackDataHandler & INamingContainer & this is my IpostBackDataHandler implementation
if (!this.Text.Equals(postCollection[postDataKey]))
{
this.Text = postCollection[postDataKey];
retVal = true;
}
return retVal;
}
#endregion IPostBackDataHandler Implementation
#### ERROR BEGIN ####
Invalid postback or callback argument.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Invalid postback or callback argument.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50712.6; ASP.NET Version:2.0.50712.6
Sorry I should have updated this thread when I found the work around.
RC gave me a better error message which helped me in fixing this.
## Actual Error ##
Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback
or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
You can also benefit from those features by leaving it enabled then register your control for event validation. Simply add the following call in the PreRender or Render page life cycle then your control should work without having to turn off eventValidation:
This will not work on PreRender, the error is as such "RegisterForEventValidation can only be called during Render();
"... but there is not OnRender event available. Any suggestions on how to keep the validation on and get around this problem? Again, this problem only occurs in RC1.
Has anyone found a correct way to resolve this issue?
Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
How to do this? As someone said before, it is not possible to do it in PreRender and there is no Render event.
there is Render event in base class. to use it :
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
MyBase.Render(writer)
End Sub
but, the problem is I do not know how to use RegisterForEventValidation method. where is the example for this?
I also don't know what to do.. the mdsn isn't very helpful, too.
But I wanted You, if you can do me a favour.
If You find out how to solve the Problem, couldi you please send me an Email. Cause usually I'm not using english forums.
I promise I'll post the solution if I find it, too.
I have the same problem with a VS.NET 2003 application upgraded to 2005 (release version). I receive the error from a page used to upload a file. I have tried the following, but it did not help:
Protected Overrides
Sub Render(ByVal writer
As System.Web.UI.HtmlTextWriter)
Page.ClientScript.RegisterForEventValidation(Me.EdiFile.UniqueID)
Page.ClientScript.RegisterForEventValidation(Me.Upload.UniqueID)
MyBase.Render(writer)
End Sub
Page.ClientScript.RegisterForEventValidation(this.UniqueID); does not work because
_requestValueCollection is never initialized in Page class. so function
EnsureEventValidationFieldLoaded never will load dictionary with
UniqueIDs and in this way cannot find control which is authorized to make postback via
RegisterForEventValidation.
It is uselss to call Page.ClientScript.RegisterForEventValidation
Actually I wanted to say that call to Page.ClientScript.RegisterForEventValidation(this.UniqueID);
will not work because in Page class there is variable
_requestValueCollection, never initialized and in this way function
EnsureEventValidationFieldLoaded will not work properly.
Result of this is that a call to Page.ClientScript.RegisterForEventValidation(this.UniqueID) is useless and cannot change picture. Only EnableEventValidation="false" can make things to work.
Has anyone found a good solution for this?
I just upgraded my app from beta 2 to final and keep see this error in my error log quite a log. I can't reproduce this myself, but I see a lot of people get this error on my site.
I don't want to disable validation, but that's the only solution I found that works.
<div>Hi, I typed some code to Export GridView to Excel file and it is working fine. I am using VS.NET (Released Version). Here is the complete code that I used. I have copied this code from my VS.NET editor so its absolutly working and correct. </div>
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class GridViewExportDemo : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
GridView1.DataSource = BindData(); GridView1.DataBind();
}
}
private DataSet BindData()
{
//make the query
string query = "SELECT * FROM Categories";
SqlConnection myConnection = new SqlConnection(ConnectionString);
SqlDataAdapter ad = new SqlDataAdapter(query, myConnection);
DataSet ds = new DataSet(); ad.Fill(ds, "Categories");
return ds;
}
private string ConnectionString
{
get
{
return @"Server=localhost;Database=Northwind;Trusted_Connection=true";
}
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Clear();
Response.AddHeader("content-disposition", "attachment;filename=FileName.xls");
Response.Charset = "";
// If you want the option to open the Excel file without saving than
// comment out the line below
// Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/vnd.xls";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
GridView1.RenderControl(htmlWrite);
Response.Write(stringWrite.ToString()); Response.End();
}
public override void VerifyRenderingInServerForm(Control control)
{
// Confirms that an HtmlForm control is rendered for the specified ASP.NET server control at run time.
}
}
I recently posted an example of this in another thread. Essentially, you need to spearately call this method for each control value that you want to make admissible. The following code runs without an error on my system:
<script runat="server">
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
ClientScript.RegisterForEventValidation("DropDownList1", "Canada")
ClientScript.RegisterForEventValidation("DropDownList1", "Mexico")
ClientScript.RegisterForEventValidation("DropDownList1", "United States")
MyBase.Render(writer)
End Sub
</script>
can't help me if i'm dynamically creating the listbox items at runtime, right? i don't know at the time the page loads what my list items will be.
I added EnableEventValidation="false" to my @Page directive, and now i can submit the form with the client-side populated listbox. In my Protected Sub btnSave_Click event, when I iterate the listbox that was populated client-side, I cannot see any items
in the list. Any ideas?
I think the error you get is because of a control within the page, not the page itself, therefore you have to see which control changes its structure, during postbacks and try to make your own custom control derived from the one you just use. You need to
override the LoadPostData function, because inside in the original function there is a call to a ValidateEvent function which crashes, because the original data that was sent to the client is not the same with the one that is received on the server.
the truth of the matter is, the behaviour has been changed substantially. Changing the Page Directive to circumvent validation is certainly NOT the answer.
If I create a DataList that is bound in code beside, and add any Button or ImageButton to the Item Template then the above error occurs when the control is clicked on the client. I can resolve this for a Button by setting the UseSubmitBehaviour property
to false. I can not resolve it for an image button at all.
If I however add the Image Button dynamically in the code beside, there are no problems.
A LinkButton always works as expected (but looks lousy).
Dynamically making an ArrayList of the Controls in the code beside, to be later used in the Render method with a call to
RegisterForEventValidation does not seem productive. I expect a control added in the designer to be
automatically registered. Any other behaviour is not acceptable.
I am not a newbie and have been working with ASPNET for five years now. In the example below "ImageButton1" produces the error when clicked.
I have investigated further, and find that this problem always occurs when the DataList has not been assigned a DataSource in the Designer Mode. I feel this is very poor practice, as I prefer using code beside for this.
One work around is to assign the DataList a "dummy" DataSource at design time and then use the following in code to change to the actual DataSource in Code Beside:
if
(!IsPostBack) {
DataList1.DataSourceID = ""; //very important - the old Binding is removed !!
DataList1.DataSource = AccessDataSource2;
DataList1.DataBind();
}
My tries with ClientScript.RegisterForEventValidation(string) in the Reder method did not work.
(in ItemDataBound - alEventControls is an ArrayList)
foreach (Control ctrl
in e.Item.Controls) {
if (ctrl is
ImageButton || ctrl
is Button) {
alEventControls.Add(ctrl.ClientID);
}
}
(in Render Method)
foreach (string strID
in alEventControls) {
this.ClientScript.RegisterForEventValidation(strID);
}
base.Render(writer);
Can you send me a repro that I can directly run? It is difficult looking at code fragment and trying to figure out what the problem is.
Also, perhaps there is a misconception that you need to call RegisterForEventValidation in order to work, this is not true. Users only need to call RegisterForEventValidation if they are rendering the control markup directly without using the server side
control model. For example, by adding dropdown list items dynamically on the client side.
Thanks,
Ting
This posting is provided "AS IS" with no warranties, and confers no rights.
The problem that I had was with a DataList containing buttons that always raised the above exception when the button was clicked.
The real root of the problem (opposed to the work around which in fact does work) was that the ViewState was enabled and the DataList DataBind() was still being called on every PostBack (not caught by an if (!IsPostBack)). I'm assuming that this causes the
internal identities of the buttons to change (as seen by ASP 2.0) compared to the original page and causes the security exception.
Of course doing the above (with ViewState enabled calling DataBound on every PostBack) is not the usual practice, but it was handy for some scenarios in ASP 1.1 where it worked without a problem.
I don't really think that this behaviour is to be expected or wanted since the controls are just being rebound "unecessarily", IMHO they should not raise this exception in this scenario.
I have two dropdown boxes on a page - both ASP controls, one displays a list of the customers sites and when the user selects a site the second dropdown is populated with a list of locations for that site via javascript. This is causing the same problem
that everyone else on the page is having.
I got round it by using the RegisterForEventValidation() method and specifying all the possible locations that could be selected. It's a pain but it's the only way I could get round it.
If need be, you can also turn of validation for an individual page using the <%@ Page %> directive. That way you don't need to turn it off for the entire site.
Can anyone explain why we need EnableEventValidation property? What function does it serve? How it works? It will help me to determine
repercussions of turning it off.
The EventValidation feature is a new feature in ASP.NET 2.0, and provides an additional level of checks to verify that a postback from a control on the client is really from that control and not from someone malicious using something like a cross-site script
injection to try and manipulate things.
It is part of our overall strategy of increasingly adding security in depth levels to the programming model -- so that developers can be secure by default even if they forget to add security checks of their own.
Having said that, there are perfectly valid times when it is ok to turn it off (much like the ValidateRequest property we added in V1.1) - what we are trying to-do is have developers conciously turn it off when they don't want to use it, as opposed to forcing
them to remember to turn it on when they should (since the former approach ends up making apps more secure).
If need be, you can also turn of validation for an individual page using the <%@ Page %> directive. That way you don't need to turn it off for the entire site.
Hope this helps,
Scott
If I write a usercontrol is it possible to turn it off just for that? From memory, a usercontrol doesn't have a <% @ Page %> directive does it?
Correct -- you can't turn this off at the user-control level. Instead, you'd want to configure it to be off on the page that is hosting the user-control.
I'm sorry to revisit this thread again (It's getting a bit big now ;), but can I just verify that we are saying that by calling "Page.ClientScript.RegisterForEventValidation(x.UniqueID)" within the Render event won't register dynamic controls
for event validation?
If not, I can't seem to get it working :'(
I've done the following: (xEventRegister is the uniqueID of the dynamic control)
Protected
Overrides
Sub Render(ByVal writer
As System.Web.UI.HtmlTextWriter)
But it still throws up an error on postback of these controls. I'v noticed that the field in the page's form __EVENTVALIDATION changes when I do this however, so I'm wondering if there is something in
addition that I should be doing? I know I can turn EnableEventValidation off for this page, but I would prefer not to, and use this security feature as intended if I can.
Calling the above method activates event validation (unless you have it turned off for the page). So writing the above code will actually turn it on rather off.
Yes, I want to turn it on. Basicly I've created a dynamic control, but even registering it for event validation seems to be causing this validation error. The only way I can get around this is by turning validation off for this page (which I was seeing if
I could avoid).
I don't see a way to register the weather.com client-side script for validation. It has three INPUT fields:
1) A hidden one named "what" with value "WeatherLocalUndeclared"
2) A textbox named "where" that takes a zipcode or city, state
3) An image that appears to be used as the submit button.
What's the proper way to register these? I'd like to have this client-side script on my site, and I can't disable validation because it's a security risk, and some of my events actually don't fire with it off (e.g., command button click events).
I believe I was able to solve my issue just now after several days of working on this. This forum was helpful in giving me ideas. Here is my scenario. Hopefully it will be helpful to someone.
I have a several webforms that all have GridView controls. All of the webforms inherit from a custom Pagebase class. The Pagebase class inherits from System.Web.UI.Page. The only code in the class file for each webform is:
Protected Sub Page_Init(ByVal sender
As Object,
ByVal e As System.EventArgs)
Handles Me.Init
'Set the Pagebase exposed Manager for this page
mobjMgr = New AwardCLS("ccAward")
'Set the Pagebase reference to the gridview for this page
mobjGrid = GridView1
'Set the Pagebase reference to the form on this page
mobjForm = Me.Master.FindControl("Form1")
End Sub
Now everything was working great until I decided to add a Navigation control to a master page and have my webforms use the master page. After setting one of my webforms to use the master page, clicking the add or edit button in the grid would cause the Invalid
postback error. After reading this forum all the way through for the second time, I thought about the page.postback check.
In the following code I'm binding the reference to the grid in the Pagebase class. I call the LoadGridView from the Form_Load in my PageBase class. Enclosing the LoadGridView call in an If Page.IsPostback = False fixed the issue for me.
Protected Overridable
Sub LoadGridView()
Dim dtGridItems
As New DataTable
dtGridItems = mobjMgr.LoadTable()
If dtGridItems.Rows.Count > 0
Then
mobjGrid.DataSource = dtGridItems
mobjGrid.DataBind()
Else
mobjGrid.Visible = True
mobjGrid.FooterRow.Visible = True
End If
End Sub
It's really strange. I've got a similar problem to you.
It is definitely the Master Page that is the source of my problem. If I change the page back to not using a Master Page, everything works and then when I use the Master Page it breaks. I even went to the length of commenting out all the code in the page that
wasn't working, removing all event handlers such as linkbutton_click and customvalidator_servervalidate. Upon posting back the page, I still got "Invalid postback or callback argument." and some blurb about EnableEventValidation.
I tried using a completely empty Master Page and it DID WORK. This means that it's not the presence of a Master Page that is inherintly problematic. It is something in
my Master Page that it didn't like. I'll slowly add things to my 2nd Master Page from the first one until it breaks. That should provide a clue!
By the way, this problem does not manifest itself in Firefox. I've seen it in IE and another browser at a friend's house. (it wasn't one of the bigger names)
My MasterPage contained a UserControl which in turn had a PayPal form for a "Donate" button. I've not yet established if it is the very existance of a nested <form></form> section that it doesn't like or if it was the hidden <input> tags that went inside it.
For my project to work, I just need to find a different way to take PayPal donations. I've got the PayPal controls for "BuyNowButton" and that sort of thing but not donations.
That's outside the scope of this discussion, anyway. The important thing I can report back is that having a second <form> tag which lived inside a user control which was then placed on the MasterPage caused that error in my situation, although not on Firefox.
Very strange.
So this is all well and good but has anyone actually figured out why?
From what I can tell from this post the only way to figure it out is to spend several days trying random things until you find that one control that's causing the problem for some reason that you can't figure out. That's at least what I've gathered from
all the posts here. But is there any real good explanation so that I can try and deduce what control on my page is causing this error that wasn't causing this error in 1.1
I have two dropdowns
City and County
When you select a county it gets a list of cities using an xmlhttprequest in javascript and fills the city drop down with this list.
The only way I found to fix it was to make the city a HtmlSelect contorl instead of a dropdownlist
I am getting the Error "RegisterForEventValidation can only be called during Render()" when I want to Export to Excel from GridView Control.
Export to Excel for GridView is working in normal aspx page. But when I implement with ATLAS AJAX Framework, EnableEventValidation = "false" disables all errors and no export is taking place. When I view source code in html, I am not able to see GridView
control at all.. Any idea how to resolve this???
I have three DropDownList Web Server Control.I use client script to change state.It cause the same.So I try to use HtmlSelect Html Server Control.It's nothing to happened.
I am having a problem with this error, I (or any other developer at the company) has never seen it, but it our biggest bug. After doing some searching and general messing about I found that if I run a slowdown proxy (NetLimiter or similar) and simulate
a dialup connection, I can make the error happen. It seems to be when you have a master page with some controls at the top, the page is loading slowly, the top controls are visible (login stuff) the user then enters their details before the rest of the page
is complete and submits it. This means that the __EventValidation form field is not present and the exception occurs.
Any ideas on how to prevent this in this situation (our biggest error), I am reluctant to turn it off but I may have to...
You may want to venture down the road of using javascript to enable the login submit button after the page is loaded. You should be able to find plenty of examples using google, to accomplish this task.
I'm new to these boards, but am getting this error... and a weird one! Would really apprecaite any help/advice!
I have a page which displays records from a database, and has various postback buttons (add new record, edit record etc), however when I click any of these items it errors (Re: Invalid postback or callback argument). The strange thing is, this error only
occurs in IE. I don't understand how I'm getting a server-side error occuring only in one client browser.
I've a usercontrol that's load into a aspx page. In this usercontrol, there is a datagrid which have imagebuttons on header and datagriditem that enable sort or selection.
The original version of this was write for .net framework 1.1 and work fine for 6 months.
I've start to migrate my application to dotnet 2 to have the news advantages of this versions.
But, all of my project look to work fine but, when i click a imagebutton of my datagrid in my usercontrol, i get the following error :
"Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that
arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for
validation."
The bind of my data on the datagrid is good.
I've try to put enableEventValidation @ false but the only things happend is that the page reload (with the error) but the callback not seems to be called (In debug mode, the event are not call)
I have read through and tried every sollution given and none seem to work, not removing the master page or the clientscript validation. Each problem seems to be different. I have two Listbox's and one is loaded with data, when you select an item in listbox1
and click a button or double click the item in listbox1, javascript is used to copy that selected item to listbox2. Now the funny thing that happens. If I click the submit button to load the next page, everything works fine. If I select an item in Listbox2
then click the button to load the next page. That is when I get the error message. So my problem seems to be with the ListBox2 control itself and the fact that is was updated clientside.
Point being, I don't think we are going to find a single fix for everyone.
I found a sollution to my own problem and will post it in the event it might help someone else. As some items in my script are company confidential i'll have to remove actual names. This was done in VB by the way.
Protected
Overrides
Sub Render(ByVal writer
As System.Web.UI.HtmlTextWriter)
'<item below is taking all the information from database that will be dynamically used to copy from Listbox1 to Listbox2>
ColumnNames = instance.getColumnNames()
<cycle through all the entries adding them to the clicentscript register. Make sure you used the "ToString()" behind UniqueID it will not work without it.>
For Each item
As String
In ColumnNames
Me.ClientScript.RegisterForEventValidation(ListBox2.UniqueID.ToString(), item.ToString())
Next
MyBase.Render(writer)
End Sub
I think it's strange that there is no standard "solution". I am using
Ajax.Net and, as far as i can see, eeryone who uses Ajax will have this problem. It is a common situation to change a value in one DropDown and refilling by xmlhttp another dropdown [:|]. In my case putting the enableEventValidation
=false worked very well. Registering all the elements that came from the xmlhttp wasn't possible because
this framework doesn't go thru the page life cycle[:(]
I know this is a little late since it's been a while since your post; however, I hate it when forums are not updated...
If you are doing databinding in the load event of the page, and you are getting this problem, make sure that you check to make sure it's not a postback by wraping it in an if block. I had this problem after I added some client code to send a confirmation
popup.
I finally found a way to register for event validation. Hopefully this helps the rest of you.
My situation was that I have GridView controls where the user needs to be able to click anywhere on the row to select the row, and be sent to another page. The way I had done this was to add an
onclick attribute to the actual row during RowDatabound...
This of course resulted in the error message due to EventValidation being enabled. What worked for me was to use
Page.ClientScript.GetPostBackEventReference(Control control, string argument, bool registerForEventValidation)
during Render...
I know this is a little late since it's been a while since your post; however, I hate it when forums are not updated...
If you are doing databinding in the load event of the page, and you are getting this problem, make sure that you check to make sure it's not a postback by wraping it in an if block. I had this problem after I added some client code to send a confirmation
popup.
I had the same problem with a treeview control, bound to an XMLdatasource. In the aspx page design, not the code behind file.
I solved it by;
1) setting enableEventValidation="false" in web.config
Which stopped the error displaying, but the treeview still froze, if the user clicked to expand a node before the page was fully displayed.
I solved that by adding an event handler;
Protected Sub TreeView1_TreeNodeExpanded(ByVal sender
As Object,
ByVal e As System.Web.UI.WebControls.TreeNodeEventArgs)
Handles TreeView1.TreeNodeExpanded
' it solves the problem even though it does nothing ?!?
End Sub
Search for <form> tags in project. You are probably have two <form> tags in your page. It was hard to figure it out because of masterpage. I noticed an html form tag in masterpage and deleted it. It's ok now. Hope this will save
you from getting crazy.
I have two drop down lists and a submit button on a page. change in one list pops up values from database in other list..But on clicking of submit button.. it shows this error message.
Rather if i take html server button, it works fine..
Can anybody suggest what might be the reason behind these differences..
I know this is a little late since it's been a while since your post; however, I hate it when forums are not updated...
If you are doing databinding in the load event of the page, and you are getting this problem, make sure that you check to make sure it's not a postback by wraping it in an if block. I had this problem after I added some client code to send a confirmation
popup.
if(!IsPostBack)
{ BindData();
}
Hope this helps..
Thanks for the fix!
I also needed to add the if block to the DataList_itemDataBound code, 'cause I'm tinkering with the output:
protected
void DataList1_ItemDataBound1(object sender,
DataListItemEventArgs e)
{
if (!IsPostBack)
{
// lots of funky code
}
}
If you don't add the if block here the server can't find controls inside the datalist templates - like labels, textboxes etc
This maybe of some help to user with paypal buy-now buttons getting this error:
I think when using master pages you nest the forms within a form and this causes the error but i found i had 3 buy now buttons two of them worked fine just not the first button. I tried all the fixes none worked so i put a dummy form tag before the first
button and now all works fine and i don't have to set validation to false.
Why this works beats me ask the more experienced among us!
I am wondering if anyone is still monitoring this thread. I have an almost similar problem and I have tried almost every solution presented by this thread but sadly, nothing works for me.
I have posted a new thread on my problem at the following link, please take a second to read the post and help me out. I am really beyond despair at this problem. [:S]
I have managed to resolve my problem pertaining to my last post. For the benefits of those who might be facing the same issues that I had, please visit my post below.
I have the same problem with the EnableEventValidation when I do click in an ImageButton which is in a template field of a DataGrid.
I have tried with <pages enableEventValidation = "false"> but it doesn't work.
I have seen int this forum that the problem is possible to be in one of the controls, so I created a new datagrid and tryed it again but it didn't work too.
I don't find where can be the error. ¿Anyone has solved it?¿What must I do to reach my goal?
I noticed that in my case, the Invalid Post back was not the real problem. Actualy the page was hanging. Only when I clicked the button twice did I get the error. (I still don't know why it's hanging)
Thanks to Nick for his post, I was getting this error but it turned out that it was simply because the html mock-up that I converted into an aspx page had form tags in it. Glad I don't have to do the ugly work-arounds that others have had to do...
Hi all, I have a completely different scenario, but I get the same message. I have a page that has a Wizard control on it. I get the error after these steps:
from any page navigate to the wizard page
click the wizards next button
The wizard displays step 2
click the browsers back button
click the browsers forward button
Now the wizard goes back to step 1
If I then click on the wizard's next button I get the aforementioned error. I am not doing any data binding on this page. I do have some javascript involved. Wizard step 1 updates some dollar amount fields based on an input field, it's called from OnKeyUp
and also in the pages startup.
Obviously this is not the normal flow. However, the user can, and in all likelihood
will, do this at some point. What I would like to know is, in my situation, is there any way to prevent this? Some other facts that may be helpful:
I tried this with Firefox and I get the same error
If I do not click the wizards next button (step 2) I do not get this error.
the debugger will stop on a breakpoint I put in the pages Init event handler (but not Load)
I have considered giving up on the wizard control and just hiding/showing the user controls & buttons myself. I will try this while I wait for some kind soul to help me out :-)
I have considered giving up on the wizard control and just hiding/showing the user controls & buttons myself. I will try this while I wait for some kind soul to help me out :-)
Hi all, I have a completely different scenario, but I get the same message. I have a page that has a Wizard control on it. I get the error after these steps:
from any page navigate to the wizard page
click the wizards next button
The wizard displays step 2
click the browsers back button
click the browsers forward button
Now the wizard goes back to step 1
If I then click on the wizard's next button I get the aforementioned error. I am not doing any data binding on this page. I do have some javascript involved. Wizard step 1 updates some dollar amount fields based on an input field, it's called from OnKeyUp
and also in the pages startup.
Obviously this is not the normal flow. However, the user can, and in all likelihood
will, do this at some point. What I would like to know is, in my situation, is there any way to prevent this? Some other facts that may be helpful:
I tried this with Firefox and I get the same error
If I do not click the wizards next button (step 2) I do not get this error.
the debugger will stop on a breakpoint I put in the pages Init event handler (but not Load)
I have considered giving up on the wizard control and just hiding/showing the user controls & buttons myself. I will try this while I wait for some kind soul to help me out :-)
Thanks in advance!
The browser back button is always an ongoing issue for web developers. I'm successfully using the wizard control with a radAjaxPanel (Telerik.com). It works for me, however, I hadn't considered the back button in the particular application. I'll need to
look at that now.
I am getting this error in a WebControls.Calendar control when I click the "next month" link too quickly one after the next. For example, if I click "March" and then the page seems to load but I click "April" really quick (possibly before the page finishes
something?), sometimes the error appears. It's definitely intermittent, and doesn't ever seem to appear if I go slowly through the various months (which do cause postback each time in order to load the data for the given dates).
Here's my stack trace:
[ArgumentException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.] System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +2082537 System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +106 System.Web.UI.WebControls.Calendar.RaisePostBackEvent(String eventArgument) +48 System.Web.UI.WebControls.Calendar.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +174 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102
I came across something similar when trying to get my GridView1 pager label, lblPager, to display a view all link along with the normal paging. I found this link that solved my problem. I also included the solution from the link as well. Hope this helps.
I replaced the "Select$" with "Page$" and "findGrid" with "GridView1"
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
If findGrid.Rows.Count > 0 Then
For Each row As GridViewRow In findGrid.Rows
If row.RowType = DataControlRowType.DataRow Then
row.Attributes.Add("onclick", Page.ClientScript.GetPostBackEventReference(findGrid, "Select$" & row.RowIndex, True))
End If
Next
End If
As zhouyuheng, i think that disable enableeventvalidation is not the response because
1- it's necessary in certain case
2- the probleme is not the eventvalidation, but the code_behind of caller page.
this error occured when datas load in OnLoad sub are updated by the user. When the page is reloaded, datas are not the same and can cause a eventvalidation error.
in my case, change the onload code was the answer. i load datas in OnPreRender.
When loading datas in onLoad is require, i don't see how do it
Is this a bug that was never fixed? I am using .NET 2.0 (not a beta) with the Web Developer Express 2005 and get the same exception with my language drop down box that I placed on the Master Page. If I do not enable postback nothing happens but then it does
not work as (naturally). If on the other hand I enable Postback for the control then it craps out with the exception shown earlier in this thread.
Out of curiosity (before reading the rest of the thread) I used the RegisterClientScriptForValidation(this.DropDownLanguage.UniqueID) but it did not work either. I tried on both OnPreRender and Render.
So basically the last Localization example on quickstars.asp.net does not work (I checked everything already)
So according to this post ASP.NET considers itself malicious :-)
Now, I have the same problem when trying to use the language localization example in a master page. The DropDown list is populated in Page_Load just as in the example. But as soon as I select an option in the drop down I get the exception named in this
thread.
I have found no way to overcome this problem and I don't want to disable the event check because this is in a master page used all over the site. In this case converting it to HTML select does not do the trick because I need to postback the selection to
the server.
So, if anybody wants to replicate it, go to quickstarts.asp.net, look under Internationalization and fetch the last example of Localization in which the language is selected by means of a drop down. Of course this assumes you only have a single page, put
it in a master page and your problems begin.
but still m getting the same error...Can anyone help?
Actually My page is having two dropdown one for region and other for activity.If I donot select any activity(i.e. all activity) the error fires however same thing doesnot happen If I select an activity from the dropdown
but still m getting the same error...Can anyone help?
Actually My page is having two dropdown one for region and other for activity.If I donot select any activity(i.e. all activity) the error fires however same thing doesnot happen If I select an activity from the dropdown
I started getting this error today after I pasted some new controls and code into a web form. Whenever I clicked on a button on the page I got the error.
The databound controls on my page were being populated as part of Page_Load. When the button on my page is clicked I do not need the databound controls to be rebound automatically in Page_Load so I put in the line,
If IsPostBack Then Exit Sub
As soon as I did this, the validation error stopped occurring.
I felt after finding the solution to my problem in this thread, that I ought to post my experiences with this problem.
Mine were particularly baffling as my form's validation would work without issue in Firefox (2.0) but NOT in IE7. I had 3 text fields that perform very simple (is there something or isn't there) validation on each of them. The first field is required, the
2nd two are optional but at least one of them must be completed.
My first field (the required one) would validate correctly every time, but as soon as I tried to force an error in the 2nd two fields (by leaving them empty) I would receive the error page in IE7 when in Firefox the form would validate (or not) as expected.
Adding the EnableEventValidation="false" statement to the Page declaration in my ASPX file, caused the problem to go away. Everything validates and works as expected in all browsers. I have to be honest though, I still have no idea what caused the browser
specific error pages and ABSOLUTELY no idea as to why turning OFF event validation would not only fix the error but still allow my validation events to fire. If anyone has any updates on this, I'd be interested to read them.
Thanks to everyone on this thread over the past 2 years though - Probably wouldn't have fixed this so quickly without you all. Cheers,
Thank you Ken. the nested <form/> was exactly my problem.
For some reason client-side JS is not submitting __EVENTVALIDATION field back to the server in MSIE in such situation. (However, everything works fine in Mozilla). This problem can be easily diagnosed by examining HttpContext.Current.Request.Form collection
sometime early in the page's lifecycle, for instance in InitializeCulture() override ..
I found this post while looking for a solution to this same type of issue. In my case I would receive the invalid postback error when I updated a DropDownList (someListDDL) that was also a trigger for an UpdatePanel. It seemed that is my case the only
available option was to add the @
Page EnableEventValidation="false"
but that seemed to only got me so far. The error message was gone and the SelectedIndexChanged event was fired but nothing was happening. When I debugged the page line by line it turned out that the DropDownList I updated wasn't passing
it's selected value anymore. By switching from someListDDL.SeletedValue to Request["someListDDL"] I was able to get the selected value. So far this seems to be completely MS AJAX
compatible.
TekisFanatikus, thanks! I had almost two identical pages where one page responded to a button contained in a datagrid and the other didn't, it produced the above error. The datagrid on the page needed to respond to some filtering done by
dropdown list selection...so, rather than create an event for the selection change, i was using Get/Set from the viewstate to respond to the values in the dropdown lists. Well, one drop down list was static, the other populated from a query...for some silly
reason the drop down list that was populated from query, did not respond to the Get/Set in the viewstate. So, i set the values manually and put in a .databind() in postbacks...which worked well, until i added a button. Then, once i clicked the button, it
would produce, an error. I still required the databind, so i moved .databind() into the button's event handler and this cleared up the said error.
In my master page inherited content, I would get the same error this thread is about. I created a blank page, added a button control and it worked fine.
After further review of my master page, I found that the search block, I um, borrowed from another site had been wrapped in a form tag. The orginal site was all html. As soon as I removed the duplicate form tag from my master page, all my postbacks went
back to working as advertised.
I just spent the better part of an hour trying to resolve the same issue.
All my pages are .html pages
I have javascript to make pages post back to .html (since i can't change the form action from .aspx to .html)
What was trying to do was populate a Repeater, and then have a button for each item. This is for a shopping cart. Everything displayed fine, i populated the repeater, had an ItemDataBound to populate each Item/AlternatingItem, which all had a Button in it.
When a button was clicked it threw that error.... the problem was i was doing the DataBind in the Page_Load(), so when the page posted back it was Binding again so there was no data for the ItemCommand.
I resolved the issue by change Page_Load() to Page_PreRender().
I have face the same problem i search on the net i find some thing but i not exectly find the solution i find that if we call this function with these parameter then this error never occour
Scenario: Creating composite controls, which implements INamingContainer--Interface.
Explanation/Reason for the problem: 1.) Real Reason lies in the dynamic generation of id's for the various composite controls being used.
2.) Currently, though, you are implementing, the INamingContainer--Interface, and plus, even the frameworkalso asists, in generating the dynamic id's of the controls created on the web-page, while creating
custom/user controls we often need to generate the ids of the controls getting created. Specially, to determine the position of the controls to get that control, on any postback.
3.) Now while dynamically generating these id's, if in case, you are generating the "SAME ID -- FOR 2 CONTROLS -- say for example -- the linkbuttons -- " the framework will not be able to catch it at
the compile time.
4.) But during the next post-back of/on the same control, the framework/compiler, knows that there are two controls with the same id on the page, and this is wrong from the point of view that you are using
two controls with same id on the page though you are implementing the INamingContainer--Interface, and even the .net framework doesnt allow this.
5.) Hence you get the error message for this -- "Invalidpostback or callback argument".
6.) Also, since there are two controls on the page, with the same id, the framework, is not able to determine the values of __EVENTTARGET and __EVENTARGUMENT.... these will hold values null.
7.) If u debug...it might let u debug till page_load end statement, but after this instead of passing the control to the event handler u will receive the "Invalidpostback or call back argument".
SOLUTIONS: 1.) Make for these controls EnableEventValidation as false.
2.) At the page level also, u can mention EnableEventValidation as false.
3.) At the whole application level, i.e in the web.config also, u can specify EnableEventValidation as false.
4.) All these will harm the security of your application and your machine -- I strongly "dont" recommend this.
5.) Best Solution -- Where you are generating the id's for the controls -- dynamically -- for eg, say -- txtBoxUser = this.Id + " _1" + _txtBox"; check such scenarios -- becoz it is somewhere here where you are generating
the similar id's of the controls.
6.) Debug to find this .... the unique ids getting generated. Take care of for loops wherein sometime, the counter's of for loops are the only differentiators for generating the ids of the controls dynamically --typical example -- to determine
the row position.
Scenario: Creating composite controls, which implements INamingContainer--Interface.
Explanation/Reason for the problem: 1.) Real Reason lies in the dynamic generation of id's for the various composite controls being used.
2.) Currently, though, you are implementing, the INamingContainer--Interface, and plus, even the frameworkalso asists, in generating the dynamic id's of the controls created on the web-page, while creating
custom/user controls we often need to generate the ids of the controls getting created. Specially, to determine the position of the controls to get that control, on any postback.
3.) Now while dynamically generating these id's, if in case, you are generating the "SAME ID -- FOR 2 CONTROLS -- say for example -- the linkbuttons -- " the framework will not be able to catch it at
the compile time.
4.) But during the next post-back of/on the same control, the framework/compiler, knows that there are two controls with the same id on the page, and this is wrong from the point of view that you are using
two controls with same id on the page though you are implementing the INamingContainer--Interface, and even the .net framework doesnt allow this.
5.) Hence you get the error message for this -- "Invalidpostback or callback argument".
6.) Also, since there are two controls on the page, with the same id, the framework, is not able to determine the values of __EVENTTARGET and __EVENTARGUMENT.... these will hold values null.
7.) If u debug...it might let u debug till page_load end statement, but after this instead of passing the control to the event handler u will receive the "Invalidpostback or call back argument".
SOLUTIONS: 1.) Make for these controls EnableEventValidation as false.
2.) At the page level also, u can mention EnableEventValidation as false.
3.) At the whole application level, i.e in the web.config also, u can specify EnableEventValidation as false.
4.) All these will harm the security of your application and your machine -- I strongly "dont" recommend this.
5.) Best Solution -- Where you are generating the id's for the controls -- dynamically -- for eg, say -- txtBoxUser = this.Id + " _1" + _txtBox"; check such scenarios -- becoz it is somewhere here where you are generating
the similar id's of the controls.
6.) Debug to find this .... the unique ids getting generated. Take care of for loops wherein sometime, the counter's of for loops are the only differentiators for generating the ids of the controls dynamically --typical example -- to determine
the row position.
I like many people am getting this error, I've had a read through most of this thread and just want to clarify there is no solutions for what im doing other than turning of event validation.
I have 2 drop down boxes, when you select an item in drop down 1 I use my own Ajax calls to populate drop down 2 with items from a database. I'm not using the MS Ajax framework and I dont want to if I can avoid it. As soon as a postback occurs after this
I get the error. Are there any workarounds other than disabling this validation? Just turning it off for the page isnt really an option either as I use user controls and this 1 page is used with many different user controls depending on what the user requested
so in effect this 1 page is actaully about 20 different pages.
Invalid postback or callback argument.
I encountered with this error in ASP.Net 2.0 with master page implementation.
The error is:
System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.ArgumentException: Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true"
%> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation
method in order to register the postback or callback data for validation. Resolution : Remove the <form> tag from
content form which has implemented master page. Since, master page also have <form> tag. The two <form> tag makes an error.
If your problem is having a dynamic dropdownlist, populated by AJAX or Javascript code, prepolulate this list with all possible values (must be unique!). This way your dynamic code can filter the list values (i.e. based on selected value in another dropdown
list) and that will not cause a invalid postback. And you won't need to disable event validation!! Hope this helps ;-)
dropdownlist javascript ajax asp.net RegisterForEventValidation
I toohaving same problem what you people were had.... Can anyone solve this problem without changing
enableEventValidation
to false... Since that will cause some security problem in entire application or page. Suppose we are working some big projects means, this solution wont be goood, by changing eventvalidation to false
may cause some other problem....
So please anyone find out the better solution for this... If found I will also share with you...
Fantastic! This solution worked for me! My problem was related to having hidden fields on my form. I do not have any "duplicate ids" or duplicate "form" tags. If the hidden fields are in the form - problem exists. Comment them out, problem goes away - but
then my form didn't work. Go figure.
Anyway - Thanks again, your solution saved the day! [:)]
OK, Let me see. If I understand what you're saying. The reason I'm getting the error is becuse I have placed a control(in this case RadioButtonlist) onto a masterpage and I have created two pages with this masterpage. The radio buttons work fine on the first
page but not on the second because of the ID. I now have two controls with the same name. Is this correct?
If so how do I resolve this issue with setting the enableEventValidate to fales. Which for me is not an option.
OK, well after looking thru the code once more. I had a form tag on the page attached to the masterpage. This page is comments/sugguestion page which I need the form tag so the users can submit the form. or is there a better way?
I new to this stuff and I'm getting very confused....
Just a note. I had this problem on a page with a mix of asp:Panel and AJAX UpdatePanels. I was very confused because my proof-of-concept page worked fine but when I incorporated things into my main page I started having this problem. Anyway, I am moving
toward UpdatePanels in the overall site but haven't finished so there are some of both. I'm sure you know where this is going. . . After fiddling with things for a while I thought to change the few UpdatePanels to vanilla Panels. Problem went away.
I have a page that creates an asp:imagebutton for each item (row) in a datagrid.
I had made a mistake and I was binding the datagrid at every Page_Load. When the imagebutton click event fired and do a postback, the page would reload and rebind the button. I presume ASP was detecting that the imagebutton created during databind shared
the same ID as the button doing the postback and throwing this Invalid postback error.
Problem resolved by only binding the datagrid at Page_Load if the page is NOT a Postback.
i.e. the familiar...
If NOT Page.IsPostBack() Then
This unual thing happened with me also.I also received my error suddenly.
I had .Net 1.1 and .Net 2.0 on my machine and i confiugured an IIS application and started accessing it.It worked fine for some time but after a particular navigator it used to crash with this error logged.Just while debugging the problem i opened the property
page for my IIS application and looked in the ASP.NET tab and there it was set to 2.0.xxxx version.But how is my Asp.net 1.1 application running fine.It should have given some coonfiguration error in web config atleast.When i actually changed it to 1.1.xxxx
My application started behaving fine.
Didnt get time to look into how was few on my pages where eally displayed and what was the stuff that was actually causing the crash.But what is the harm in giving it a try ,who know it may work for you also.
After lot of R and D I didnt find the solution except
EnableEventValidation="false"
and this is final from my side
As many people have said before, disabling Event Validation is tantamount to laying down a doormat welcoming XSS attacks. I still haven't found a solution, although I keep looking from time to time.
For me, at least, this problem was caused because I was updating a control outside of the updatepanel, which in turn, caused this error to come up. In one case, I was changing the visibility of a control outside of the updatepanel, but the control was
still visible. Then when I clicked on any control within said user control, this error would pop up.
Maybe that'll get you thinking in a different direction.
I had a problem with invalid postback or callback argument related to a datagrid after a .net 2.0 upgrade and MasterPage implementation. The datagrid is located in a user control and i tried with changing it to a gridview, setting the validation to false
and so forth but eventually it turned out that a DataBind in the MasterPage page_load was the cause. So a (!isPostback) check before the databinding in the MasterPage fixed the problem for me. It actually caused some other pages to stop function correctly
so i also implemented a check if this specific page is loaded then the (!isPostback) is runed.
I also had the same issue - in my case due to adding controls in code behind without an ID > id was autogenerated and when the control was replaced by another one they got the same id throwing that error.
I was also having the same problem using nested master pages. It looks like if the nested master page has the <form> tag in it anywhere, this error will be produced. As soon as a removed the <form> tag from the nested master page, all was well.
In my case it originated from having a <form>-tag inside the <form runt="server">-tag - an old relic from an old HTML-page that taged along. Now, this doesn't apply to a Custom Control, but it might be the page he inserts the Custom Control on that has the
same HTML-bug, in which case the control will fail.
I also have the same problem. I have no problem if the button is clicked when the page is fully loaded in the browser. But if clicks when the page is loading, getting the same exception. I have used the clientscript.RegisterForEventValidation, not resolved
my problem. Help me out of this.....
I had that problem in a page that contained a gridview component which had a datasource filtered according to a parameter obtained from querystring. If i used postback check method in form load event to disable duplicate databinding then all data in table
was listed when i clicked Edit, Cancel, Update, Delete buttons in any row as no filter was being applied when the form was reloaded.
I solved that problem using these steps:
I checked ispostback variable to disable multiple databinding in form load event
I rebinded the control in gridview's RowCanceling, RowDeleted and RowEditing events.
In other words i ran the code to recreate SQL statement for data source using querystring parameter and rebind gridview under above listed events.
I hope this helps people who is changing datasource during run-time and having that silly problem.
Yalin Meric
Software Projects Coordinator
Ebit Informatics Inc.
www.e-bit.com.tr
I got the same error:
Invalid postback or callback argument. Event validation is enabled using <PAGES enableEventValidation="true"></PAGES>in configuration or <%@ Page EnableEventValidation="true" %>in a page. For security purposes, this feature verifies that arguments to postback
or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
and in my case i came to the conclusion that was a logical error in my code.
I was trying to do this :
Protected Sub dtaLingue_ItemCommand(ByVal source
As Object,
ByVal e As System.Web.UI.WebControls.DataListCommandEventArgs)
Handles dtaLingue.ItemCommand
but in my case, the correct way is this one:
Protected Sub dtaLingue_ItemCommand(ByVal source
As Object,
ByVal e As System.Web.UI.WebControls.DataListCommandEventArgs)
Handles dtaLingue.ItemCommand
My problem relates to the article that I posted earlier where I was attempting to add a value from client script to an asp drop down control in which the application thinks I am performing an injection attack. My question is, if I create a custom drop down
control and called it namespace MyDropDownControl, if I leave out the attribute [SupportEventsValidation] can and will my control override that portion of the dropdown?
The reason for me asking is because I don't want to diable the page event validation but the solution was to register my value to the control upon Render, in which I can only do that if the value was already known. In my case, it's whatever value the user
will enter and add. Therefore, if it is possible, my class will disable the event validation for just that instance of my class rather than the whole page. Any comments, suggestions, or knowledge about this?
Thanks everyone! :)
"If you have knowledge, let others light their candles in it."
— Margaret Fuller
" Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies
that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data
for validation. "
This has only been experienced by users who have been using the website whilst the same page has been updated. It has been reported occasionally during busy times too. The problem arises from a asp.net 2.0 drop-down control that is in an Ajax Update Panel
(i.e., when a user selects an item from it). But, it only occurs in the scenario I have described.
This occurs usually from users using Firefox, though it has occurred sometimes with IE7 users. However, I can only recreate the problem in Firefox.
I've tried a number of possible solutions using the ClientScriptManager.RegisterForEventValidation, but none have solved this problem. Changing <%@ Page EnableEventValidation = "false" %> has temporarily solved the problem, but I don't really want this
solution long term.
The project is an ASP.Net 2.0 AJAX enabled website. It uses masterpages.
Any help on this appreciated.
Thanks - Darren
Code behind choicesWeb Application ProjectsWeb.config allowDefinition MachineToApplication solution Web Application ProjectserrorSession stateATLAS AJAX Cascading Dropdown ComboboxAutoPostBack ScriptManager Focus Preserve Mantain PostBack DropDownListASP.Net 2.0dropdownlist javascript ajax asp.net RegisterForEventValidationUnHandledException causing CLR to terminateASP.Netpage_loadAttempted to read or write protected memory. This is often an indication that other memory has been corruptedweb deployment projects2.0javascripteventvalidation
I know this is a little late since it's been a while since your post; however, I hate it when forums are not updated...
If you are doing databinding in the load event of the page, and you are getting this problem, make sure that you check to make sure it's not a postback by wraping it in an if block. I had this problem after I added some client code to send a confirmation
popup.
if(!IsPostBack)
{ BindData();
}
Hope this helps..
Hi there [:D]
Thanks for this post, u r a life saver. i have been getting this error "invalid postback or callback argument & blah blah......" ever since i migrated my code from asp.net 1.0 to asp.net 2.0. by this time i was in complete frustation because i had tried
everything found on the net like setting 'enableeventvalidation' to false in page directive & check which control was giving the error but nothing seemed to be working. The funny thing was same code was working well for other screens & that made me curious
until i read ur post.
I forgot to check in my page load that i was actually binding the data to the grid on postback inside the page load event. thanks a lot for this [Idea]
For those having the same error on postback with or without a popup on ur page please make to check for postback before u bind the data to the grid.
if !page.ispostback then
grid.databind()
end if
I hope this thread helps to everyone who are receiving this error at any time in their code.[Yes]
To Solve This Problem What You Have to Do Just Write Following Code in Web.Config. system.web> Doing this One It’s Solve Your Problem But It’s Effect On Your Site Security. Basically EnableeventValidation of asp.Net pages are ture.Wich Prevent Injection
Attack.Make it’s False Involve This Injection Attack.
You solved my problem with this exception! All i had to do on my <asp:GridView> was set enableViewState="false" and suddenly that ugly error went away!
I admit to being new to C# and these little things really get me pulling my hair out.
Say you have a dropdownlist with items and a listbox which get clientside populated with items you select from the dropdownlist.
The below code solves the invalid postback data. You have to register all possible values the listbox can contain in the render method.
protected override void Render(HtmlTextWriter writer)
{
//register the items from the dropdownlist as possible postbackvalues for the listbox
foreach (ListItem option in _dropDownList.Items)
{
Page.ClientScript.RegisterForEventValidation(_listBox.UniqueID, option.Value);
}
base.Render(writer);
}
I just figured out a solution to my version of this problem. Previously my code worked great in IE, but terribly in FireFox.
1. Removed all <asp:ObjectDataSource> objects from the form and put all databinding in the code-behind.
2. Removed all worthless code in my gridview's pageindexchanging. There was a while when it would only run with the code, but eventually it worked without it.
Has anyone found a good solution for this?
I just upgraded my app from beta 2 to final and keep see this error in my error log quite a log. I can't reproduce this myself, but I see a lot of people get this error on my site.
I don't want to disable validation, but that's the only solution I found that works.
I don't know if this will help you but I used the following solution to fix my problem since I ran into the same situation. I just wanted to pass the info along.
As easy as this may sound, all I did was wrap my page load events inside of a IsPostBack check. On my page_load event, I have a series of binding routines to set up a gridview that exists on my page. This is what I did:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not Page.IsPostBack Then
' My customized gridview setup routines
myGridView.Initialize(myCustomParemter)
End If
End Sub
I am getting this error in a WebControls.Calendar control when I click the "next month" link too quickly one after the next. For example, if I click "March" and then the page seems to load but I click "April" really quick (possibly before the page finishes
something?), sometimes the error appears. It's definitely intermittent, and doesn't ever seem to appear if I go slowly through the various months (which do cause postback each time in order to load the data for the given dates).
Here's my stack trace:
[ArgumentException: Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.] System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +2082537 System.Web.UI.Control.ValidateEvent(String uniqueID, String eventArgument) +106 System.Web.UI.WebControls.Calendar.RaisePostBackEvent(String eventArgument) +48 System.Web.UI.WebControls.Calendar.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +174 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102
Anyone got any ideas on how to correct this?
Thanks in advance...
In case anyone else is having the same issue, I found that the calendar will generate this error if using the updatepanel with
UpdateMode
="Conditional" and
ChildrenAsTriggers="False"
Also, remove all the triggers and this error will go away. Website with ajax enabled will work without specifying the triggers. At first, I did try both setting validation to false and
RegisterForEventValidation the calendar but that didn't fix it.
Would you mind posting some of the code? The only thing I can think is that something else outside the if(!IsPostBack) is causing the the page to load twice. Perhaps a custom control or operation outside your postback check. Hope that helps some :-).
The ATZ
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We were seeing these intermittantly and I was finally able to reproduce some by using Fiddler and simulating modem speed. Turns out a postback is being done before the page finishes loading. The hidden __EVENTVALIDATION happens to be about the last stuff
rendered on the page so it gets lopped of thus the error.
I found this fix on how to move __EVENTVALIDATION to be rendered earlier http://blogs.msdn.com/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx I went to test and have now discovered that some update either NET 3.5, VS 2008 or their
SP1's has now caused the EVENTVALIDATION to be rendered much earlier.
Anyway so some of these problems may suddenly go away and here is probably the explanation.
We were seeing these intermittantly and I was finally able to reproduce some by using Fiddler and simulating modem speed. Turns out a postback is being done before the page finishes loading. The hidden __EVENTVALIDATION happens to be about the last stuff
rendered on the page so it gets lopped of thus the error.
This is somewhat off topic, but how do you simulate modem speed?
There is an option in Fiddler2 under Rules/Performance - 'Simulate Modem Speeds'. Don't know what speeds it simulates but it will definetly slow you down.
I have the same problem with a asp:button that is hooked to an extender I wrote which basically disables it when clicked. I scoured these forums and Google for two days and came up with nothing. The extender has some javascript which changes the buttons
text value from "Submit" to "Loading..." once clicked and disables it so it can't be clicked again. I tried the following line of code in the render event I overrode:
protected override void Render(HtmlTextWriter writer)
{
PostBackOptions myPostBackOptions = new PostBackOptions(myButton);
//Add the Postback event
if (Page.ClientScript.GetPostBackEventReference(myPostBackOptions).Length > 0)
{
m_Button.CausesValidation = false;
myPostBackOptions.PerformValidation = false;
Page.ClientScript.RegisterForEventValidation(myPostBackOptions);
}
base.Render(writer);
}
but get the same exception. It is weird, it is the the fact that the button is disabled on the client which is causing the error, not the changing of the value in my javascript to "Loading...". If I don't disable the button but still change the text value
to "Loading..." it works fine (and without the need to call RegisterForEventValidation()). If you are supposed to pass in a second argument called "parameters " to RegisterForEventValidation what should that argument be if it is the disabled property causing
the button to not function? If anyone has the answer to this question it would be greatly appreciated!
So I basically disable the button on the first line, set the text on the other lines, then to start postback I call eval() passing in the postbackreference string I got by calling ClientScript.GetPostBackEventReference() on the server. Commenting out the
first line that disables the button resolves the error, so it is disabling the button that causes the validation to fail.
Oct 07, 2008 12:41 PM|extremelogic@hotmail.com|LINK
I was able to resolve this issue by taking GridView's DataBind() statement off from the page load event. I was changing a parameter value of the Gridview datasource at run time and was firing a DataBind command to refresh the grid on the page load.
I moved that statement to the button_click event of search button and it resolved the issue. What I have noticed that if you have a command button in the grid and you try to DataBind in the page load event then it will generate this error.
Protected
Sub Page_Load(ByVal sender
As
Object,
ByVal e
As System.EventArgs)
Handles
Me.Load
End Sub
Private
Sub btnSetCookies_ServerClick(ByVal sender
As Object,
ByVal e As System.EventArgs)
Handles btnSetCookies.ServerClick
End Sub
Protected
Overrides Sub Render(ByVal writer
As System.Web.UI.HtmlTextWriter)
the poeple who use my website are getting this invalid postback error as well.
i also can't recreate it so can't do anythign systematically to try and fix it.
what i have noticed though is that in the pages that have been affected one of the developers has passed a control through as a parameter.
example: (all code here is on the same form)
Protected
Sub ddlSearchTeam_SelectedIndexChanged(ByVal sender
As Object,
ByVal e As System.EventArgs)
Handles ddlSearchTeam.SelectedIndexChanged
Load_TOUsers(ddlTOUsers)
'the above is a call to a sub. it is passing in ddlTOUsers which is a dropdownlist on the form itself
End Sub
Private Sub Load_TOUsers(ByVal ddl
As DropDownList)
'the above is the sub that is being called. it does some code and fills ddl with names of people. ddl is a direct copy of the control on the form. this sub runs on page load, and and a selection of another drop down list box.
End Sub
now my question is: is it the fact that it is "ByVal" in the private sub that could be causing a problem? because its basically creating a direct copy of the ddlTOUsers control at its current state.
if it was changed to "ByRef" i'm wondering if it will fix it. i'm putting this out here becuase, as i say i cant recreate the problem so dont know if its a fix or not.
this allows me to slow down my internet connection to copy a modem connection. this meant that i could then go onto my website, attempt to load up a page and then click or do something before the page had loaded fully. this caused the invalid postback error.
i could now cause this error on command which means i could debug it properly.
i then added the following code to the page_load event, outside of the check for page.ispostback.i go back to my website again and try to cause the invalid postback error and the code now catches it and outputs a nice messagebox.
Page.ClientScript.RegisterHiddenField("PageLoadedHiddenTxtBox",
"")
Dim scriptCommand
As String =
"document.getElementById('PageLoadedHiddenTxtBox').value ='Set';"
Dim preSubmitCommad
As String =
"var loaded=document.getElementById('PageLoadedHiddenTxtBox').value; if(loaded=='Set'){return true};alert('please wait for page to completely load before submitting to site.');return false;"
Page.ClientScript.RegisterStartupScript(Me.[GetType](),
"onLoad", scriptCommand,
True)
Re: Invalid postback or callback argument(Solution Fixed)
May 26, 2009 06:03 AM|vivek.kumar@proteans.com|LINK
HI All, This issue can be fixed by three ways. the first two methods are common for all.so i am giving third one. you can trace this error and you can redirect it to Your Custom error page by the help of webconfig file. just you need to place this between By
this if any default error would come ,then this will redirect ErrorPage.aspx"
The Invalid Postback or Callback argument can happen in multiple different scenarios in multiple different cases. However the root reason that I figured out in all cases that remains is the fact that the event that took place happened with a control that
had got different ID than when the action was about to be taken. To understand my point consider this example:
I had a Grid on my Page with Delete buttons to delete a particular row in the Grid. Now everytime I click on the Delete Button, even before the action for the event of Delete button took place the GridView was rebinded which results in the change of Contorl
ID for the Delete button as for the Grid that was rebinded all the ID's were different or atleast regenerated than from the one on which I clicked delete button on and hence the result was this error. I tried allmost solutions posted on this page but nothing
worked. Than using Firebug I decided to study all the control details because on same page a similar grid with similar logic of delete button functionality was working fine and not the second one. And boom got the solution. Removing the grid.databind() from
the place before the action for delete does the trick for me. And than I tried other example that were posted and yeah as I though on most of it the problem was the ID of the control was different at the time was page trying to take the corresponding action
against the ID control at the time even took place. So knowing that most of the problem posted on this thread had the solution in the same manner I think almost all the errors that anyone has got can be fixed if they just check that whether the control is
getting regenerated anywhere in the code before the corresponding action for their particular event is taken.
Hope People find it correct solution.
.NET 3.0.net 1.1 2.0 web serverApp_CodeInvalid postback or callback argument.
I have a dropdownlist with only two elements. On selectedindexchanged the gridview is reloaded. PROBLEM: one of the element has an accent. The web site is on another computer from the network. When I debug in my local computer no error. When I debug remotely
or try to access it in the remote computer and try to select in the dropdownlist the element with an accent, error, saying "Invalid postback or callback argument". Strange detail. If the element with an accent is the first selected on page load, fine for the
first load. Change to another without accent, everything is fine. Change back to the one used in the page load... error... Please, any help is welcome. I already lost two days with this sh...
One other really strange detail. If I'm in the port 80 of the remote machine, everything works, but under port 82 (our developper port) I get this error all the time.
In the process of upgrading a 1.1 app to 3.5, I ran into this problem. I added the solution using VB.Net, although the suggested solution was in C#. Not hard to convert it over...
Protected Overrides Sub Render(ByVal writer As HtmlTextWriter)
Register(Me) 'the C# equivalent used "this" which is the me equivalent...odd
Me.Render(writer)
End Sub
Private Sub Register(ByVal ctrl As Control)
Dim c As Control
For Each c In ctrl.Controls
Register(c)
If TypeOf c Is System.Web.UI.WebControls.DropDownList Then
Else
Page.ClientScript.RegisterForEventValidation(ctrl.UniqueID)
End If
Next
End Sub
Anyway, it didn't work. I can see where I've done anything wrong, though perhaps I have and missed it. Brain fog.
The form I'm working with has several textboxes and 2 dropdownlists. What I'm wondering is whether I have to add the values for all items in both dropdownlists to get it to pass validation?
I also have wondered whether I need to use the PostBackOptions object or the ValidateEvent method before it resolves the problem? Any help is greatly appreciated! I've been trying to get over this problem for almost 2 months with little luck. Thanks!
FWIW I had the same issue and resolved it by getting rid of the asp:Button and handling the code (on submit) w an input button.
I defined the button on my aspx page as such:
Private Sub Submit1_ServerClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Submit1.ServerClick
DataCheck()
If tfValidated <> "False" Then
FillinStrings()
'Server.Transfer("Entry.aspx")
btnSubmit.Visible = False
pnlUpdate.Visible = False
lblError.Visible = True
lblError.Text = "Your time has been submitted. Thank you."
Submit1.Visible = False
End If
End Sub
Hope this is a good alternative for the ones that have tried the other alternatives w no success.
None
0 Points
4 Posts
Invalid postback or callback argument.
Sep 27, 2005 09:15 AM|krathni|LINK
I have a composite control which consists of label, linkbutton & textbox control. Depending on the display mode (a property within the control) one of the control gets displayed. However when the linkbutton is clicked it seems to throw up this error. The control works fine in .NET 1.1.
The control inherits from System.Web.UI.WebControls.WebControl, IPostBackDataHandler & INamingContainer & this is my IpostBackDataHandler implementation
#region IPostBackDataHandler Implementation
void IPostBackDataHandler.RaisePostDataChangedEvent()
{
OnTextChanged(System.EventArgs.Empty);
}
bool IPostBackDataHandler.LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection)
{
bool retVal = false;
if (!this.Text.Equals(postCollection[postDataKey]))
{
this.Text = postCollection[postDataKey];
retVal = true;
}
return retVal;
}
#endregion IPostBackDataHandler Implementation
#### ERROR BEGIN ####
Invalid postback or callback argument.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.ArgumentException: Invalid postback or callback argument.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[ArgumentException: Invalid postback or callback argument.]
System.Web.UI.ClientScriptManager.ValidateEvent(String uniqueId, String argument) +2088580
System.Web.UI.WebControls.TextBox.LoadPostData(String postDataKey, NameValueCollection postCollection) +89
System.Web.UI.WebControls.TextBox.System.Web.UI.IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) +11
System.Web.UI.Page.ProcessPostData(NameValueCollection postData, Boolean fBeforeLoad) +718
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3817
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:2.0.50712.6; ASP.NET Version:2.0.50712.6
None
0 Points
29 Posts
Re: Invalid postback or callback argument.
Sep 30, 2005 11:18 AM|gerrod|LINK
I have some code generating the same exception - only my code used to work in Beta 2 (v2.0.50215), and now doesn't work in RC1 (v2.0.50712).
Can someone from MS please comment on this exception? Is this part of the security changes from Whidbey Beta 2 to RTM, regarding bubbling of events?
None
0 Points
29 Posts
Re: Invalid postback or callback argument.
Sep 30, 2005 11:52 AM|gerrod|LINK
I found a work-around to my problem. Try adding this into the <system.web> section of your web.config file:
Works for me.
/gerrod
None
0 Points
4 Posts
Re: Invalid postback or callback argument.
Sep 30, 2005 01:06 PM|krathni|LINK
RC gave me a better error message which helped me in fixing this.
## Actual Error ##
Invalid postback or callback argument. Event validation is enabled using <pages enableEventValidation="true"/> in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
None
0 Points
176 Posts
Re: Invalid postback or callback argument.
Sep 30, 2005 06:03 PM|JoeBerg|LINK
Page.ClientScript.RegisterForEventValidation(
this.UniqueID);Hope this helps,
Joe
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Oct 24, 2005 06:22 PM|morda31|LINK
Thanks
Sincerely,
Oleg
Participant
1241 Points
699 Posts
Re: Invalid postback or callback argument.
Nov 01, 2005 09:12 AM|mreyeros|LINK
None
0 Points
5 Posts
Re: Invalid postback or callback argument.
Nov 05, 2005 03:55 AM|Aphelion|LINK
How to do this? As someone said before, it is not possible to do it in PreRender and there is no Render event.
None
0 Points
7 Posts
Re: Invalid postback or callback argument.
Nov 06, 2005 05:54 PM|zhouyuheng|LINK
there is Render event in base class. to use it :
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
MyBase.Render(writer)
End Sub
but, the problem is I do not know how to use RegisterForEventValidation method. where is the example for this?
Member
1 Points
7 Posts
Re: Invalid postback or callback argument.
Nov 14, 2005 01:53 PM|Entity|LINK
I also don't know what to do.. the mdsn isn't very helpful, too.
But I wanted You, if you can do me a favour.
If You find out how to solve the Problem, couldi you please send me an Email. Cause usually I'm not using english forums.
I promise I'll post the solution if I find it, too.
thank you very much!
regards Tuldi@gmx.net
Patrick
None
0 Points
7 Posts
Re: Invalid postback or callback argument.
Nov 16, 2005 12:03 PM|Keith Walton|LINK
I have the same problem with a VS.NET 2003 application upgraded to 2005 (release version). I receive the error from a page used to upload a file. I have tried the following, but it did not help:
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)Page.ClientScript.RegisterForEventValidation(Me.EdiFile.UniqueID)
Page.ClientScript.RegisterForEventValidation(Me.Upload.UniqueID)
MyBase.Render(writer)
End Sub
None
0 Points
7 Posts
Re: Invalid postback or callback argument.
Nov 17, 2005 03:49 PM|zhouyuheng|LINK
<%@ Page Language="C#" MasterPageFile="~/Admin/MasterPage_Admin.master" AutoEventWireup="true" CodeFile="CategoryManagement.aspx.cs" Inherits="Admin_CategoryManagement" Title="Untitled Page" EnableEventValidation="false" %>
None
0 Points
15 Posts
Re: Invalid postback or callback argument.
Nov 25, 2005 10:15 AM|Michail2|LINK
It is uselss to call Page.ClientScript.RegisterForEventValidation
Regards
Michail
None
0 Points
15 Posts
Re: Invalid postback or callback argument.
Nov 25, 2005 02:03 PM|Michail2|LINK
Result of this is that a call to Page.ClientScript.RegisterForEventValidation(this.UniqueID) is useless and cannot change picture. Only EnableEventValidation="false" can make things to work.
Regards
Michail
None
0 Points
30 Posts
Re: Invalid postback or callback argument.
Dec 04, 2005 11:54 PM|Werdna|LINK
Has anyone found a good solution for this?
I just upgraded my app from beta 2 to final and keep see this error in my error log quite a log. I can't reproduce this myself, but I see a lot of people get this error on my site.
I don't want to disable validation, but that's the only solution I found that works.
Contributor
2831 Points
4430 Posts
Re: Invalid postback or callback argument.
Dec 08, 2005 08:49 PM|azamsharp|LINK
using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Data.SqlClient; public partial class GridViewExportDemo : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { GridView1.DataSource = BindData(); GridView1.DataBind(); } } private DataSet BindData() { //make the query string query = "SELECT * FROM Categories"; SqlConnection myConnection = new SqlConnection(ConnectionString); SqlDataAdapter ad = new SqlDataAdapter(query, myConnection); DataSet ds = new DataSet(); ad.Fill(ds, "Categories"); return ds; } private string ConnectionString { get { return @"Server=localhost;Database=Northwind;Trusted_Connection=true"; } } protected void Button1_Click(object sender, EventArgs e) { Response.Clear(); Response.AddHeader("content-disposition", "attachment;filename=FileName.xls"); Response.Charset = ""; // If you want the option to open the Excel file without saving than // comment out the line below // Response.Cache.SetCacheability(HttpCacheability.NoCache); Response.ContentType = "application/vnd.xls"; System.IO.StringWriter stringWrite = new System.IO.StringWriter(); System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite); GridView1.RenderControl(htmlWrite); Response.Write(stringWrite.ToString()); Response.End(); } public override void VerifyRenderingInServerForm(Control control) { // Confirms that an HtmlForm control is rendered for the specified ASP.NET server control at run time. } }HighOnCoding
None
0 Points
6 Posts
Re: Invalid postback or callback argument.
Dec 13, 2005 03:06 AM|gollkla|LINK
I there nobody from MS who can help us? The way MS implemented this new security feature is nonsens ...
Member
530 Points
295 Posts
Re: Invalid postback or callback argument.
Dec 16, 2005 02:18 PM|ClayCo|LINK
I recently posted an example of this in another thread. Essentially, you need to spearately call this method for each control value that you want to make admissible. The following code runs without an error on my system:
<%@ Page EnableEventValidation="true" Language="VB" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
<script runat="server">
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
ClientScript.RegisterForEventValidation("DropDownList1", "Canada")
ClientScript.RegisterForEventValidation("DropDownList1", "Mexico")
ClientScript.RegisterForEventValidation("DropDownList1", "United States")
MyBase.Render(writer)
End Sub
</script>
<script type="text/javascript">
function InitializeDDL()
{
var oOption = document.createElement("OPTION");
document.all("DropDownList1").options.add(oOption);
oOption.innerText = "Canada";
oOption = document.createElement("OPTION");
document.all("DropDownList1").options.add(oOption);
oOption.innerText = "Mexico";
oOption = document.createElement("OPTION");
document.all("DropDownList1").options.add(oOption);
oOption.innerText = "United States";
}
</script>
</head>
<body onload="InitializeDDL();">
<form id="form1" runat="server">
<div>
<asp:DropDownList ID="DropDownList1" runat="server">
</asp:DropDownList>
<asp:Button ID="Button1" runat="server" Text="Button" />
</div>
</form>
</body>
</html>
HTH,
Clay
Member
2 Points
95 Posts
Re: Invalid postback or callback argument.
Jan 02, 2006 11:08 PM|www2005|LINK
this...
<script runat="server">
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
ClientScript.RegisterForEventValidation("DropDownList1", "Canada")
ClientScript.RegisterForEventValidation("DropDownList1", "Mexico")
ClientScript.RegisterForEventValidation("DropDownList1", "United States")
MyBase.Render(writer)
End Sub
</script>
can't help me if i'm dynamically creating the listbox items at runtime, right? i don't know at the time the page loads what my list items will be.
Member
2 Points
95 Posts
Re: Invalid postback or callback argument.
Jan 02, 2006 11:38 PM|www2005|LINK
None
0 Points
16 Posts
Re: Invalid postback or callback argument.
Jan 04, 2006 08:47 AM|orange_square|LINK
Add a new custom control derived from the control you are using (e.g. DropDownList) and in the new class override the LoadPostData function.
protected
override bool LoadPostData(string postDataKey, System.Collections.Specialized.NameValueCollection postCollection){
return true;}
It should work. It did for me.
Regards
None
0 Points
6 Posts
Re: Invalid postback or callback argument.
Jan 05, 2006 02:27 AM|gollkla|LINK
There is no function that is named like this to override!!??
My declaration looks like this:
public class PagerTemplate : CompositeControl, ITemplate, INamingContainer{
....
}
None
0 Points
16 Posts
Re: Invalid postback or callback argument.
Jan 05, 2006 07:04 AM|orange_square|LINK
I think the error you get is because of a control within the page, not the page itself, therefore you have to see which control changes its structure, during postbacks and try to make your own custom control derived from the one you just use. You need to override the LoadPostData function, because inside in the original function there is a call to a ValidateEvent function which crashes, because the original data that was sent to the client is not the same with the one that is received on the server.
Regards
Radu
None
0 Points
227 Posts
Re: Invalid postback or callback argument.
Jan 05, 2006 09:31 PM|tinghaoy|LINK
It would help if you can post your code so we can figure out what the problem is.
Thanks,
Ting
None
0 Points
33 Posts
Re: Invalid postback or callback argument.
Jan 11, 2006 04:33 AM|ajk-eis|LINK
Hello Ting,
the truth of the matter is, the behaviour has been changed substantially. Changing the Page Directive to circumvent validation is certainly NOT the answer.
If I create a DataList that is bound in code beside, and add any Button or ImageButton to the Item Template then the above error occurs when the control is clicked on the client. I can resolve this for a Button by setting the UseSubmitBehaviour property to false. I can not resolve it for an image button at all.
If I however add the Image Button dynamically in the code beside, there are no problems.
A LinkButton always works as expected (but looks lousy).
Dynamically making an ArrayList of the Controls in the code beside, to be later used in the Render method with a call to RegisterForEventValidation does not seem productive. I expect a control added in the designer to be automatically registered. Any other behaviour is not acceptable.
I am not a newbie and have been working with ASPNET for five years now. In the example below "ImageButton1" produces the error when clicked.
HTH
Alle
<%
@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %><!
DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><
html xmlns="http://www.w3.org/1999/xhtml" ><
head runat="server"> <title>Zeiterfassung Buchungen</title> <LINK href="mip.css" rel="stylesheet"/></
head><
body> <form id="form1" runat="server"> <br /> <div> <asp:DataList ID="dlBuchungen" runat="server" OnItemCommand="Buchungen_OnItemCommand" OnItemCreated="Buchungen_OnItemCreated" OnItemDataBound="Buchungen_OnDataBind" Width = 470> <ItemTemplate> <asp:Label ID="lblUhrzeit" runat="server" Text="Uhrzeit" Width="100px"></asp:Label> <asp:Label ID="lblBuchung" runat="server" Text="Buchung" Width="150px"></asp:Label> <asp:Label ID="lblOrt" runat="server" Text="Ort" Width="150px"></asp:Label> <asp:ImageButton ID="ImageButton1" runat="server" CommandName="TEST" /> </ItemTemplate> <HeaderTemplate> <asp:Literal ID="lblTag" runat=server Text=Tag ></asp:Literal>, den <asp:Literal ID="lblDatum" runat=server Text=Tag ></asp:Literal><br />Uhrzeit
Buchung bei </HeaderTemplate> <FooterTemplate>** => Benutzer Buchung
</FooterTemplate> <HeaderStyle CssClass="tableHead" /> <FooterStyle CssClass="tableHead" /> <AlternatingItemStyle CssClass="tab_g3" /> <ItemStyle CssClass="tab_g2" /> <EditItemStyle CssClass="rkBoxBackColor" /> <EditItemTemplate> <asp:TextBox ID="txtUhrzeit" runat="server" Width="50px"></asp:TextBox> <asp:DropDownList ID="ddlKommen" runat="server" Width="110px"> <asp:ListItem>Kommen</asp:ListItem> <asp:ListItem>Gehen</asp:ListItem> </asp:DropDownList> <asp:TextBox ID="TextBox2" runat="server" Width="200px"></asp:TextBox><br /> <asp:Button ID="btnSave" runat="server" CommandName="save" Text="Speichern" UseSubmitBehavior="False" Width="150px" /> <asp:Button ID="btnCancel" runat="server" CommandName="cancel" Text="Abbrechen" UseSubmitBehavior="False" Width="150px" /> </EditItemTemplate> </asp:DataList></div> <br /> <strong>Ihr Tagessaldo betr„gt:
</strong> <asp:Label ID="lblTagSaldo" runat="server" Text="TagesStd" Font-Bold="True"></asp:Label><br /> <strong>Ihr Monatssaldo betr„gt:
</strong> <asp:Label ID="lblMonatSaldo" runat="server" Text="MonatsStd" Font-Bold="True"></asp:Label><strong> </strong> </form></
body></
html>None
0 Points
33 Posts
Re: Invalid postback or callback argument.
Jan 11, 2006 05:47 AM|ajk-eis|LINK
Hello again Ting,
I have investigated further, and find that this problem always occurs when the DataList has not been assigned a DataSource in the Designer Mode. I feel this is very poor practice, as I prefer using code beside for this.
One work around is to assign the DataList a "dummy" DataSource at design time and then use the following in code to change to the actual DataSource in Code Beside:
if
(!IsPostBack) {DataList1.DataSourceID = ""; //very important - the old Binding is removed !!
DataList1.DataSource = AccessDataSource2;
DataList1.DataBind();
}
My tries with ClientScript.RegisterForEventValidation(string) in the Reder method did not work.
(in ItemDataBound - alEventControls is an ArrayList)
foreach (Control ctrl in e.Item.Controls) {
if (ctrl is ImageButton || ctrl is Button) {
alEventControls.Add(ctrl.ClientID);
}
}
(in Render Method)
foreach (string strID in alEventControls) {
this.ClientScript.RegisterForEventValidation(strID);
}
base.Render(writer);
HTH
Alle
None
0 Points
227 Posts
Re: Invalid postback or callback argument.
Jan 11, 2006 01:52 PM|tinghaoy|LINK
Can you send me a repro that I can directly run? It is difficult looking at code fragment and trying to figure out what the problem is.
Also, perhaps there is a misconception that you need to call RegisterForEventValidation in order to work, this is not true. Users only need to call RegisterForEventValidation if they are rendering the control markup directly without using the server side control model. For example, by adding dropdown list items dynamically on the client side.
Thanks,
Ting
None
0 Points
33 Posts
Re: Invalid postback or callback argument.
Jan 12, 2006 02:42 PM|ajk-eis|LINK
To all,
The problem that I had was with a DataList containing buttons that always raised the above exception when the button was clicked.
The real root of the problem (opposed to the work around which in fact does work) was that the ViewState was enabled and the DataList DataBind() was still being called on every PostBack (not caught by an if (!IsPostBack)). I'm assuming that this causes the internal identities of the buttons to change (as seen by ASP 2.0) compared to the original page and causes the security exception.
Of course doing the above (with ViewState enabled calling DataBound on every PostBack) is not the usual practice, but it was handy for some scenarios in ASP 1.1 where it worked without a problem.
I don't really think that this behaviour is to be expected or wanted since the controls are just being rebound "unecessarily", IMHO they should not raise this exception in this scenario.
HTH
Alle
Member
2 Points
64 Posts
Re: Invalid postback or callback argument.
Jan 26, 2006 09:12 AM|NHustak|LINK
You can also get this same error if your page has a form block within the ASP.NET form block - I had it from converting over some cold fusion code.
Nick
Nick H
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Feb 16, 2006 08:49 AM|Acorn|LINK
I have two dropdown boxes on a page - both ASP controls, one displays a list of the customers sites and when the user selects a site the second dropdown is populated with a list of locations for that site via javascript. This is causing the same problem that everyone else on the page is having.
I got round it by using the RegisterForEventValidation() method and specifying all the possible locations that could be selected. It's a pain but it's the only way I could get round it.
foreach (DataRow dr in dt.Rows){
Page.ClientScript.RegisterForEventValidation( cboChild.UniqueID, Common.
DBAccess.NullValue(dr["locationid"], ""));}
It would be a lot easier if you could just turn off validation for one control or page, rather than turning of validation for the whole site :o(
Participant
1782 Points
2004 Posts
Microsoft
Re: Invalid postback or callback argument.
Feb 16, 2006 03:16 PM|ScottGu|LINK
Hi Acorn,
If need be, you can also turn of validation for an individual page using the <%@ Page %> directive. That way you don't need to turn it off for the entire site.
Hope this helps,
Scott
None
0 Points
4 Posts
Re: Invalid postback or callback argument.
Feb 17, 2006 03:09 PM|asp.net_programmer|LINK
Can anyone explain why we need EnableEventValidation property? What function does it serve? How it works? It will help me to determine repercussions of turning it off.
Thank you
Participant
1782 Points
2004 Posts
Microsoft
Re: Invalid postback or callback argument.
Feb 17, 2006 08:41 PM|ScottGu|LINK
The EventValidation feature is a new feature in ASP.NET 2.0, and provides an additional level of checks to verify that a postback from a control on the client is really from that control and not from someone malicious using something like a cross-site script injection to try and manipulate things.
It is part of our overall strategy of increasingly adding security in depth levels to the programming model -- so that developers can be secure by default even if they forget to add security checks of their own.
Having said that, there are perfectly valid times when it is ok to turn it off (much like the ValidateRequest property we added in V1.1) - what we are trying to-do is have developers conciously turn it off when they don't want to use it, as opposed to forcing them to remember to turn it on when they should (since the former approach ends up making apps more secure).
Hope this helps,
Scott
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Feb 20, 2006 03:58 PM|Acorn|LINK
If I write a usercontrol is it possible to turn it off just for that? From memory, a usercontrol doesn't have a <% @ Page %> directive does it?
Participant
1782 Points
2004 Posts
Microsoft
Re: Invalid postback or callback argument.
Feb 20, 2006 05:29 PM|ScottGu|LINK
Hi Acorn,
Correct -- you can't turn this off at the user-control level. Instead, you'd want to configure it to be off on the page that is hosting the user-control.
Hope this helps,
Scott
None
0 Points
8 Posts
Re: Invalid postback or callback argument.
Mar 01, 2006 03:54 AM|Radderz|LINK
Hi All,
I'm sorry to revisit this thread again (It's getting a bit big now ;), but can I just verify that we are saying that by calling "Page.ClientScript.RegisterForEventValidation(x.UniqueID)" within the Render event won't register dynamic controls for event validation?
If not, I can't seem to get it working :'(
I've done the following: (xEventRegister is the uniqueID of the dynamic control)
Protected
Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)MyBase
.ClientScript.RegisterForEventValidation(xEventRegister(0))MyBase
.Render(writer)End
SubBut it still throws up an error on postback of these controls. I'v noticed that the field in the page's form __EVENTVALIDATION changes when I do this however, so I'm wondering if there is something in addition that I should be doing? I know I can turn EnableEventValidation off for this page, but I would prefer not to, and use this security feature as intended if I can.
Participant
1782 Points
2004 Posts
Microsoft
Re: Invalid postback or callback argument.
Mar 01, 2006 10:39 AM|ScottGu|LINK
Hi Radderz,
Calling the above method activates event validation (unless you have it turned off for the page). So writing the above code will actually turn it on rather off.
Hope this helps,
Scott
None
0 Points
8 Posts
Re: Invalid postback or callback argument.
Mar 01, 2006 11:09 AM|Radderz|LINK
Yes, I want to turn it on. Basicly I've created a dynamic control, but even registering it for event validation seems to be causing this validation error. The only way I can get around this is by turning validation off for this page (which I was seeing if I could avoid).
Member
40 Points
547 Posts
Re: Invalid postback or callback argument.
Mar 01, 2006 09:23 PM|kashif|LINK
Radderz,
The dynamic controls should get registered by making the call to
RegisterForEventValidation(this.UniqueID) - are you re-adding the dynamic control on each postback?
Thanks,
Kashif
Member
11 Points
17 Posts
Re: Invalid postback or callback argument.
Mar 03, 2006 09:07 AM|kgreen|LINK
1) A hidden one named "what" with value "WeatherLocalUndeclared"
2) A textbox named "where" that takes a zipcode or city, state
3) An image that appears to be used as the submit button.
What's the proper way to register these? I'd like to have this client-side script on my site, and I can't disable validation because it's a security risk, and some of my events actually don't fire with it off (e.g., command button click events).
Thanks.
Member
130 Points
542 Posts
Re: Invalid postback or callback argument.
Mar 21, 2006 12:41 AM|jwadsworth|LINK
I believe I was able to solve my issue just now after several days of working on this. This forum was helpful in giving me ideas. Here is my scenario. Hopefully it will be helpful to someone.
I have a several webforms that all have GridView controls. All of the webforms inherit from a custom Pagebase class. The Pagebase class inherits from System.Web.UI.Page. The only code in the class file for each webform is:
Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Init'Set the Pagebase exposed Manager for this page
mobjMgr = New AwardCLS("ccAward")
'Set the Pagebase reference to the gridview for this page
mobjGrid = GridView1
'Set the Pagebase reference to the form on this page
mobjForm = Me.Master.FindControl("Form1")
End Sub
Now everything was working great until I decided to add a Navigation control to a master page and have my webforms use the master page. After setting one of my webforms to use the master page, clicking the add or edit button in the grid would cause the Invalid postback error. After reading this forum all the way through for the second time, I thought about the page.postback check.
In the following code I'm binding the reference to the grid in the Pagebase class. I call the LoadGridView from the Form_Load in my PageBase class. Enclosing the LoadGridView call in an If Page.IsPostback = False fixed the issue for me.
Protected Overridable Sub LoadGridView()Dim dtGridItems As New DataTable
dtGridItems = mobjMgr.LoadTable()
If dtGridItems.Rows.Count > 0 Then
mobjGrid.DataSource = dtGridItems
mobjGrid.DataBind()
Else
mobjGrid.Visible = True
mobjGrid.FooterRow.Visible = True
End If
End Sub
Extended Personal Site Starter kit
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0 Points
47 Posts
Re: Invalid postback or callback argument.
Mar 25, 2006 08:35 PM|thelyonken|LINK
It is definitely the Master Page that is the source of my problem. If I change the page back to not using a Master Page, everything works and then when I use the Master Page it breaks. I even went to the length of commenting out all the code in the page that wasn't working, removing all event handlers such as linkbutton_click and customvalidator_servervalidate. Upon posting back the page, I still got "Invalid postback or callback argument." and some blurb about EnableEventValidation.
I tried using a completely empty Master Page and it DID WORK. This means that it's not the presence of a Master Page that is inherintly problematic. It is something in my Master Page that it didn't like. I'll slowly add things to my 2nd Master Page from the first one until it breaks. That should provide a clue!
By the way, this problem does not manifest itself in Firefox. I've seen it in IE and another browser at a friend's house. (it wasn't one of the bigger names)
- Ken
None
0 Points
47 Posts
Re: Invalid postback or callback argument.
Mar 25, 2006 08:48 PM|thelyonken|LINK
My MasterPage contained a UserControl which in turn had a PayPal form for a "Donate" button. I've not yet established if it is the very existance of a nested <form></form> section that it doesn't like or if it was the hidden <input> tags that went inside it.
For my project to work, I just need to find a different way to take PayPal donations. I've got the PayPal controls for "BuyNowButton" and that sort of thing but not donations.
That's outside the scope of this discussion, anyway. The important thing I can report back is that having a second <form> tag which lived inside a user control which was then placed on the MasterPage caused that error in my situation, although not on Firefox. Very strange.
Member
575 Points
303 Posts
Re: Invalid postback or callback argument.
Apr 01, 2006 03:00 PM|PureWeen|LINK
So this is all well and good but has anyone actually figured out why?
From what I can tell from this post the only way to figure it out is to spend several days trying random things until you find that one control that's causing the problem for some reason that you can't figure out. That's at least what I've gathered from all the posts here. But is there any real good explanation so that I can try and deduce what control on my page is causing this error that wasn't causing this error in 1.1
Thank you
shnae
Member
575 Points
303 Posts
Re: Invalid postback or callback argument.
Apr 01, 2006 04:39 PM|PureWeen|LINK
alright I found the control causing the error
I have two dropdowns
City and County
When you select a county it gets a list of cities using an xmlhttprequest in javascript and fills the city drop down with this list.
The only way I found to fix it was to make the city a HtmlSelect contorl instead of a dropdownlist
Member
70 Points
58 Posts
Re: Invalid postback or callback argument.
Apr 04, 2006 06:40 PM|siva sakki|LINK
I am getting the Error "RegisterForEventValidation can only be called during Render()" when I want to Export to Excel from GridView Control.
Export to Excel for GridView is working in normal aspx page. But when I implement with ATLAS AJAX Framework, EnableEventValidation = "false" disables all errors and no export is taking place. When I view source code in html, I am not able to see GridView control at all.. Any idea how to resolve this???
Siva sakki
Member
70 Points
58 Posts
Re: Invalid postback or callback argument.
Apr 05, 2006 04:48 PM|siva sakki|LINK
None
0 Points
1 Post
Try to use Html Web Control
Apr 15, 2006 10:15 PM|TerryLiang|LINK
None
0 Points
39 Posts
Re: Invalid postback or callback argument.
Apr 19, 2006 01:04 PM|fortis|LINK
Realize it's a bit late since the last post, but wanted to post an update to this issue:
Check your data binding - basically if you're binding your data onload - then check to be sure you're not calling the function twice...
Not sure why this causes an event validation - however that was our problem. Fixed now (and withOUT turning validation off...)
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Apr 23, 2006 05:44 PM|TimBailey99|LINK
Hi all,
I am having a problem with this error, I (or any other developer at the company) has never seen it, but it our biggest bug. After doing some searching and general messing about I found that if I run a slowdown proxy (NetLimiter or similar) and simulate a dialup connection, I can make the error happen. It seems to be when you have a master page with some controls at the top, the page is loading slowly, the top controls are visible (login stuff) the user then enters their details before the rest of the page is complete and submits it. This means that the __EventValidation form field is not present and the exception occurs.
Any ideas on how to prevent this in this situation (our biggest error), I am reluctant to turn it off but I may have to...
TIA
Tim
Member
130 Points
542 Posts
Re: Invalid postback or callback argument.
Apr 23, 2006 07:13 PM|jwadsworth|LINK
You may want to venture down the road of using javascript to enable the login submit button after the page is loaded. You should be able to find plenty of examples using google, to accomplish this task.
Extended Personal Site Starter kit
None
0 Points
1 Post
Re: Invalid postback or callback argument.
May 02, 2006 03:19 AM|bluehat|LINK
Hi all,
I'm new to these boards, but am getting this error... and a weird one! Would really apprecaite any help/advice!
I have a page which displays records from a database, and has various postback buttons (add new record, edit record etc), however when I click any of these items it errors (Re: Invalid postback or callback argument). The strange thing is, this error only occurs in IE. I don't understand how I'm getting a server-side error occuring only in one client browser.
Cheers
John
None
0 Points
1 Post
Re: Invalid postback or callback argument.
May 06, 2006 03:19 PM|Focalizer|LINK
Hi,
I've a usercontrol that's load into a aspx page. In this usercontrol, there is a datagrid which have imagebuttons on header and datagriditem that enable sort or selection.
The original version of this was write for .net framework 1.1 and work fine for 6 months.
I've start to migrate my application to dotnet 2 to have the news advantages of this versions.
But, all of my project look to work fine but, when i click a imagebutton of my datagrid in my usercontrol, i get the following error :
The bind of my data on the datagrid is good.
I've try to put enableEventValidation @ false but the only things happend is that the page reload (with the error) but the callback not seems to be called (In debug mode, the event are not call)
Can anybody help me ?
Thanks, Focalizer
None
0 Points
1 Post
Re: Invalid postback or callback argument.
May 08, 2006 09:44 AM|jsangari|LINK
Hi Focalizer,
I am having the Same Problem Migrating my WebApp to VS2005. Were you able to find out the cause of this.Please let me know.
Thanks,
Jasmeet
None
0 Points
22 Posts
Re: Invalid postback or callback argument.
May 12, 2006 03:01 PM|Zeus|LINK
I have read through and tried every sollution given and none seem to work, not removing the master page or the clientscript validation. Each problem seems to be different. I have two Listbox's and one is loaded with data, when you select an item in listbox1 and click a button or double click the item in listbox1, javascript is used to copy that selected item to listbox2. Now the funny thing that happens. If I click the submit button to load the next page, everything works fine. If I select an item in Listbox2 then click the button to load the next page. That is when I get the error message. So my problem seems to be with the ListBox2 control itself and the fact that is was updated clientside.
Point being, I don't think we are going to find a single fix for everyone.
None
0 Points
22 Posts
Re: Invalid postback or callback argument.
May 12, 2006 03:46 PM|Zeus|LINK
I found a sollution to my own problem and will post it in the event it might help someone else. As some items in my script are company confidential i'll have to remove actual names. This was done in VB by the way.
Protected
Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)'<item below is taking all the information from database that will be dynamically used to copy from Listbox1 to Listbox2>
ColumnNames = instance.getColumnNames()
<cycle through all the entries adding them to the clicentscript register. Make sure you used the "ToString()" behind UniqueID it will not work without it.>
For Each item As String In ColumnNames Me.ClientScript.RegisterForEventValidation(ListBox2.UniqueID.ToString(), item.ToString()) Next MyBase.Render(writer) End SubI hope this helps someone else.
None
0 Points
1 Post
Re: Invalid postback or callback argument.
May 19, 2006 07:09 AM|Remedios|LINK
Participant
1782 Points
2004 Posts
Microsoft
Re: Invalid postback or callback argument.
May 19, 2006 07:56 PM|ScottGu|LINK
One solution for the cascading drop-downlists is to use the new <atlastoolkit:cascadingdropdownlist> control that manages this for you: http://atlas.asp.net/atlastoolkit/CascadingDropDown/CascadingDropDown.aspx
Hope this helps,
Scott
None
0 Points
1 Post
Re: Invalid postback or callback argument.
May 26, 2006 08:06 AM|Anyplatform|LINK
I know this is a little late since it's been a while since your post; however, I hate it when forums are not updated...
If you are doing databinding in the load event of the page, and you are getting this problem, make sure that you check to make sure it's not a postback by wraping it in an if block. I had this problem after I added some client code to send a confirmation popup.
if(!IsPostBack)
{
BindData();
}
Hope this helps..
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Jun 18, 2006 11:20 AM|Oferadiv|LINK
I had the same problem and i solved it by adding this line to the .aspx page
EnableEventValidation
="false"Member
121 Points
83 Posts
Re: Invalid postback or callback argument.
Jun 30, 2006 09:09 AM|boebelb|LINK
I finally found a way to register for event validation. Hopefully this helps the rest of you.
My situation was that I have GridView controls where the user needs to be able to click anywhere on the row to select the row, and be sent to another page. The way I had done this was to add an onclick attribute to the actual row during RowDatabound...
protected void grdSearchResults_RowDataBound(object sender, GridViewRowEventArgs e)
{
if (e.Row.RowType == DataControlRowType.DataRow)
{
e.Row.Attributes.Add("onclick", Page.ClientScript.GetPostBackEventReference(grdSearchResults, "Select$" + e.Row.RowIndex.ToString()));
}
}
This of course resulted in the error message due to EventValidation being enabled. What worked for me was to use Page.ClientScript.GetPostBackEventReference(Control control, string argument, bool registerForEventValidation) during Render...
protected override void Render(HtmlTextWriter writer){
foreach (GridViewRow row in grdSearchResults.Rows)
{
row.Attributes.Add("onclick", Page.ClientScript.GetPostBackEventReference(grdSearchResults, "Select$" + row.RowIndex.ToString(), true));
}
base.Render(writer);
}
(Of course this means I removed the grdSearchResult_RowDatabound code)
Hope this helps,
Billy
None
0 Points
30 Posts
Re: Invalid postback or callback argument.
Jul 01, 2006 09:09 PM|TekisFanatikus|LINK
This has worked for me.
None
0 Points
4 Posts
Re: Invalid postback or callback argument.
Aug 07, 2006 06:26 AM|XAos|LINK
I had the same problem with a treeview control, bound to an XMLdatasource. In the aspx page design, not the code behind file.
I solved it by;
1) setting enableEventValidation="false" in web.config
Which stopped the error displaying, but the treeview still froze, if the user clicked to expand a node before the page was fully displayed.
I solved that by adding an event handler;
Protected Sub TreeView1_TreeNodeExpanded(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.TreeNodeEventArgs) Handles TreeView1.TreeNodeExpanded ' it solves the problem even though it does nothing ?!? End SubMember
7 Points
111 Posts
Re: Invalid postback or callback argument.
Aug 07, 2006 04:19 PM|LacOniC|LINK
Search for <form> tags in project. You are probably have two <form> tags in your page. It was hard to figure it out because of masterpage. I noticed an html form tag in masterpage and deleted it. It's ok now. Hope this will save you from getting crazy.
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Aug 23, 2006 02:39 AM|vishal423|LINK
I have two drop down lists and a submit button on a page. change in one list pops up values from database in other list..But on clicking of submit button.. it shows this error message.
Rather if i take html server button, it works fine..
Can anybody suggest what might be the reason behind these differences..
Thanks in advance
vishal
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Aug 23, 2006 08:56 PM|kiwiAGM|LINK
Thanks for the fix!
I also needed to add the if block to the DataList_itemDataBound code, 'cause I'm tinkering with the output:
protected void DataList1_ItemDataBound1(object sender, DataListItemEventArgs e)
{
if (!IsPostBack)
{
// lots of funky code
}
}
If you don't add the if block here the server can't find controls inside the datalist templates - like labels, textboxes etc
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Aug 24, 2006 08:16 AM|vishal423|LINK
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Aug 24, 2006 05:58 PM|kiwiAGM|LINK
Ummm, actually that's not true... you just need to write your code correctly[:$]
The if block around databind() was all I needed - that and some caffeine...
Member
22 Points
39 Posts
Re: Invalid postback or callback argument.
Sep 26, 2006 10:15 AM|mohawk523|LINK
This maybe of some help to user with paypal buy-now buttons getting this error:
I think when using master pages you nest the forms within a form and this causes the error but i found i had 3 buy now buttons two of them worked fine just not the first button. I tried all the fixes none worked so i put a dummy form tag before the first button and now all works fine and i don't have to set validation to false.
Why this works beats me ask the more experienced among us!
I'm Happy again
Richard
None
0 Points
89 Posts
Re: Invalid postback or callback argument.
Oct 05, 2006 03:17 PM|aspdotnetnewbie|LINK
Thanks Mohawk, that solved it for me! Wierd thing to do, but it works and at this point I'll take it.
Member
22 Points
39 Posts
Re: Invalid postback or callback argument.
Oct 05, 2006 03:34 PM|mohawk523|LINK
Glad it worked for you to....[;)]
Richard
None
0 Points
19 Posts
Re: Invalid postback or callback argument.
Oct 17, 2006 05:50 AM|rakeshtpatel|LINK
None
0 Points
89 Posts
Re: Invalid postback or callback argument.
Oct 17, 2006 07:08 AM|aspdotnetnewbie|LINK
None
0 Points
6 Posts
Re: Invalid postback or callback argument.
Nov 14, 2006 01:15 AM|emptycan|LINK
I am wondering if anyone is still monitoring this thread. I have an almost similar problem and I have tried almost every solution presented by this thread but sadly, nothing works for me.
I have posted a new thread on my problem at the following link, please take a second to read the post and help me out. I am really beyond despair at this problem. [:S]
http://forums.asp.net/thread/1463637.aspx
None
0 Points
6 Posts
Re: Invalid postback or callback argument.
Nov 14, 2006 10:25 PM|emptycan|LINK
I have managed to resolve my problem pertaining to my last post. For the benefits of those who might be facing the same issues that I had, please visit my post below.
http://forums.asp.net/1465186/ShowThread.aspx#1465186
I do hope that my explaination and resolution does make senses and will help someone. [:)]
None
0 Points
3 Posts
Re: Invalid postback or callback argument.
Nov 27, 2006 09:59 AM|Naia|LINK
Hi All,
I have the same problem with the EnableEventValidation when I do click in an ImageButton which is in a template field of a DataGrid.
I have tried with <pages enableEventValidation = "false"> but it doesn't work.
I have seen int this forum that the problem is possible to be in one of the controls, so I created a new datagrid and tryed it again but it didn't work too.
I don't find where can be the error. ¿Anyone has solved it?¿What must I do to reach my goal?
Thanks.
My HTML code is the following one:
<%
@ Page Language="C#" AutoEventWireup="true" CodeFile="WpAdmin.aspx.cs" Inherits="WpAdmin" %><%
@ Register Assembly="Infragistics.WebUI.WebDataInput.v5.2, Version=5.2.20052.27, Culture=neutral, PublicKeyToken=7dd5c3163f2cd0cb" Namespace="Infragistics.WebUI.WebDataInput" TagPrefix="igtxt" %><!
DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><
html xmlns="http://www.w3.org/1999/xhtml" ><
head runat="server"> <title>Administraci¢n de faq's.</title></
head><
body bgcolor="dimgray" background="Imagenes/fondofaqsadm.jpg" style="BACKGROUND-REPEAT: no-repeat"> <form id="form1" runat="server"> <div> <table width="683"> <tr> <td align="left" style="width: 683px; height: 46px" valign="top"> <table style="width: 682px"> <tr> <td style="width: 111px; height: 24px;"> <asp:DropDownList ID="ddlEnInc" runat="server" Font-Size="X-Small" Width="135px"> <asp:ListItem Selected="True">PROBLEMA</asp:ListItem> <asp:ListItem>SOLUCIÓN</asp:ListItem> </asp:DropDownList></td> <td style="width: 26px; height: 24px;"> </td> <td style="width: 100px; height: 24px;"> <asp:DropDownList ID="ddlTipoBus" runat="server" Font-Size="X-Small" Width="305px"> </asp:DropDownList></td> <td style="width: 22px; height: 24px;"> </td> <td style="width: 131px; height: 24px;"> <asp:TextBox ID="TextBox1" runat="server" BorderStyle="Solid" BorderWidth="1px" Font-Size="Small" Width="187px"></asp:TextBox></td> </tr> </table> <table> <tr> <td bgcolor="#000000" style="width: 100px; height: 24px; border-right: gold thin solid; border-top: gold thin solid; border-left: gold thin solid;"> <asp:Label ID="Label1" runat="server" Font-Bold="True" Font-Size="Small" ForeColor="White" Text="N£m Incidencia" Width="148px"></asp:Label></td> <td style="width: 100px; height: 24px; border-top: gold thin solid;"> <asp:Label ID="lblNumIncidencia" runat="server" Font-Bold="True" Font-Size="Small" Width="108px"></asp:Label></td> <td style="width: 100px; height: 24px; border-top: gold thin solid;"> </td> <td bgcolor="#000000" style="width: 100px; height: 24px; border-top: gold thin solid;"> <asp:Label ID="Label2" runat="server" Font-Bold="True" Font-Size="Small" ForeColor="White" Text="Tipo Incidencia" Width="148px"></asp:Label></td> <td style="width: 110px; height: 24px; border-top: gold thin solid;"> <asp:DropDownList ID="ddlTipoInc" runat="server" Font-Size="X-Small" Width="206px"> </asp:DropDownList></td> <td style="width: 122px; height: 24px; border-right: gold thin solid; border-top: gold thin solid;"> </td> </tr> </table> <table border="0" bordercolor="gold" bordercolordark="gold" bordercolorlight="gold" style="border-right: gold thin solid; border-top: gold thin solid; border-left: gold thin solid;border-bottom: gold thin solid">
<tr> <td bgcolor="#000000" style="width: 100px; border-top-width: thin; border-left-width: thin; border-left-color: gold; border-top-color: gold; height: 22px; background-color: black;"> <asp:Label ID="Label3" runat="server" Font-Bold="True" Font-Size="Small" ForeColor="White" Text="Problema" Width="148px"></asp:Label></td> <td style="border-left: gold thin solid; width: 100px;height: 22px; background-color: gainsboro; border-top-width: thin; border-top-color: gold;">
<asp:TextBox ID="txtProblema" runat="server" Font-Size="Small" Height="47px" ReadOnly="True" Width="516px" BorderStyle="Solid" BorderWidth="1px" ToolTip="Problema." ></asp:TextBox></td> </tr> <tr> <td bgcolor="#000000" style="width: 100px; border-top-width: thin; border-left-width: thin; border-left-color: gold; border-top-color: gold; height: 22px; background-color: black;"> <asp:Label ID="Label4" runat="server" Font-Bold="True" Font-Size="Small" ForeColor="White" Text="Soluci¢n" Width="148px"></asp:Label></td> <td style="border-top: gold thin solid; border-left: gold thin solid; width: 100px;height: 22px; background-color: gainsboro; border-bottom: gold thin solid;">
<asp:TextBox ID="txtSolucion" runat="server" Font-Size="Small" Height="46px" MaxLength="256" ReadOnly="True" Width="518px" BorderStyle="Solid" BorderWidth="1px" ToolTip="Soluci¢n." ></asp:TextBox></td> </tr> <tr> <td bgcolor="#000000" style="width: 100px; border-top-width: thin; border-left-width: thin; border-left-color: gold; border-top-color: gold; height: 22px; background-color: black;"> <asp:Label ID="Label5" runat="server" Font-Bold="True" Font-Size="Small" ForeColor="White" Text="Archivos de apoyo" Width="148px"></asp:Label></td> <td style="border-left: gold thin solid; width: 100px; background-color: gainsboro; border-top-width: thin; border-top-color: gold;" valign="top"> <asp:DataGrid ID="dgArchivos" runat="server" AllowPaging="True" AutoGenerateColumns="False" BackColor="White" BorderColor="#999999" BorderStyle="Solid" BorderWidth="1px" CellPadding="0" Font-Size="Small" ForeColor="Black" GridLines="Vertical" OnItemCommand="dgArchivos_ItemCommand" OnItemDataBound="dgArchivos_ItemDataBound" PageSize="5" Width="522px"> <FooterStyle BackColor="#CCCCCC" /> <SelectedItemStyle BackColor="#000099" Font-Bold="True" ForeColor="White" /> <PagerStyle BackColor="DimGray" ForeColor="Gold" HorizontalAlign="Right" Mode="NumericPages" Position="Top" /> <AlternatingItemStyle BackColor="#E0E0E0" Width="17px" /> <ItemStyle Width="17px" /> <HeaderStyle BackColor="Black" Font-Bold="True" ForeColor="White" HorizontalAlign="Center" /> <Columns> <asp:TemplateColumn> <ItemTemplate> <asp:ImageButton ID="btnEditarArch" runat="server" CommandName="Editar_Archivo" ImageUrl="~/Imagenes/edit.gif" /><asp:ImageButton ID="btnEliminarArch" runat="server" CommandName="Eliminar_Archivo" ImageUrl="~/Imagenes/papelera.gif" /> </ItemTemplate> <HeaderStyle Width="33px" /> <EditItemTemplate> <asp:ImageButton ID="btnGuardarArch" runat="server" CommandName="Grabar_Archivo" ImageUrl="~/Imagenes/guardar.gif" /><asp:ImageButton ID="btnCancelarArch" runat="server" CommandName="Cancelar_EdArch" ImageUrl="~/Imagenes/cancel.gif" /> </EditItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Nombre"> <ItemTemplate> <asp:Label ID="lblNomDoc" runat="server" Width="241px"></asp:Label> </ItemTemplate> <EditItemTemplate> <asp:TextBox ID="txtNomDoc" runat="server" BorderStyle="Solid" BorderWidth="1px" Width="234px"></asp:TextBox> </EditItemTemplate> </asp:TemplateColumn> <asp:TemplateColumn HeaderText="Ruta"> <ItemTemplate> <asp:Label ID="lblRutaDoc" runat="server" Width="241px"></asp:Label> </ItemTemplate> <EditItemTemplate> <asp:TextBox ID="txtRutaDoc" runat="server" BorderStyle="Solid" BorderWidth="1px" Width="234px"></asp:TextBox> </EditItemTemplate> </asp:TemplateColumn> <asp:BoundColumn DataField="Nombre" Visible="False"></asp:BoundColumn> <asp:BoundColumn DataField="Ruta" Visible="False"></asp:BoundColumn> <asp:BoundColumn DataField="Codigo" Visible="False"></asp:BoundColumn> </Columns> </asp:DataGrid> <table style="width: 519px"> <tr> <td style="width: 6px"> <asp:Label ID="Label8" runat="server" Font-Size="Small" Text="Nombre:" Width="52px"></asp:Label></td> <td style="width: 3px"> <asp:TextBox ID="txtNombre" runat="server" BorderStyle="Solid" BorderWidth="1px" Font-Size="Small" Width="370px" ReadOnly="True" ToolTip="Nombre del archivo a a¤adir"></asp:TextBox></td> <td rowspan="2" style="width: 93px"> <asp:ImageButton ID="btnNuevoArch" runat="server" OnClick="btnNuevoArch_Click" Enabled="False" ToolTip="A¤adir archivo" /></td> </tr> <tr> <td style="width: 6px; height: 24px;"> <asp:Label ID="Label9" runat="server" Font-Size="Small" Text="Ruta:" Width="49px"></asp:Label></td> <td style="width: 3px; height: 24px;"> <asp:FileUpload ID="fuFichApoyo" runat="server" BorderStyle="Solid" BorderWidth="1px" Font-Size="Small" Width="373px" /></td> </tr> </table> </td> </tr> <tr> <td bgcolor="#000000" style="width: 100px; height: 22px; border-top-width: thin; border-left-width: thin; border-left-color: gold; border-top-color: gold; background-color: black;"> <asp:Label ID="Label6" runat="server" Font-Bold="True" Font-Size="Small" ForeColor="White" Text="Vigor" Width="148px"></asp:Label></td> <td style="border-top: gold thin solid; border-left: gold thin solid; width: 100px;height: 22px; background-color: gainsboro">
<asp:CheckBox ID="chkVigor" runat="server" Font-Size="Small" ToolTip="Vigor de la faq" /></td> </tr> </table> <table> <tr> <td style="width: 31px; height: 26px"> <asp:ImageButton ID="btnPrimero" runat="server" OnClick="btnPrimero_Click" Height="24px" ToolTip="Ir a Primero" /></td> <td style="width: 5336px; height: 26px"> <asp:ImageButton ID="btnAnterior" runat="server" OnClick="btnAnterior_Click" Height="24px" ToolTip="Ir a Anterior" /></td> <td style="width: 8503px; height: 26px;"> </td> <td align="center" style="width: 100px; height: 26px;"> <asp:ImageButton ID="btnEditar" runat="server" OnClick="btnEditar_Click" Height="24px" Width="80px" ToolTip="Editar" /></td> <td align="center" style="width: 100px; height: 26px;"> <asp:ImageButton ID="btnEliminar" runat="server" OnClick="btnEliminar_Click" Height="24px" Width="80px" ToolTip="Eliminar" /> </td> <td align="center" style="width: 100px; height: 26px;"> <asp:ImageButton ID="btnNuevo" runat="server" OnClick="btnNuevo_Click" Height="24px" Width="80px" ToolTip="Nueva faq" /> </td> <td style="width: 3295px; height: 26px;"> </td> <td style="width: 3295px; height: 26px"> <asp:ImageButton ID="btnGrabar" runat="server" OnClick="btnGrabar_Click" Height="24px" ImageUrl="~/Imagenes/grabar_ico.jpg" Visible="False" ToolTip="Grabar" /> <asp:ImageButton ID="btnCancelar" runat="server" Height="24px" ImageUrl="~/Imagenes/cancelar_ico.jpg" Visible="False" ToolTip="Cancelar" OnClick="btnCancelar_Click" /></td> <td style="width: 3295px; height: 26px"> </td> <td style="width: 262px; height: 26px"> <asp:ImageButton ID="btnSiguiente" runat="server" OnClick="btnSiguiente_Click" Height="24px" ToolTip="Ir a Siguiente" /></td> <td style="width: 262px; height: 26px"> <asp:ImageButton ID="btnUltimo" runat="server" OnClick="btnUltimo_Click" Height="24px" ToolTip="Ir a éltimo" /></td> </tr> </table> </td> </tr> </table>
</div> </form></
body></
html>None
0 Points
17 Posts
Re: Invalid postback or callback argument.
Dec 11, 2006 09:21 PM|JLibertor|LINK
Well I am workign with two data list columns (just like Zeus)
I have EnableEventValidation="false"
I am NOT binding on postback.
NOW WHAT!?
[:'(]
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0 Points
17 Posts
Re: Invalid postback or callback argument.
Dec 14, 2006 06:59 PM|JLibertor|LINK
I noticed that in my case, the Invalid Post back was not the real problem. Actualy the page was hanging. Only when I clicked the button twice did I get the error. (I still don't know why it's hanging)
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0 Points
4 Posts
Re: Invalid postback or callback argument.
Dec 21, 2006 07:38 PM|ReTox|LINK
protected override void Render(HtmlTextWriter writer) { Register(this); base.Render(writer); } private void Register(Control ctrl) { foreach (Control c in ctrl.Controls) Register(c); Page.ClientScript.RegisterForEventValidation(ctrl.UniqueID); }I didn't test it with any AJAX, but for regular pages it works so far.
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36 Points
174 Posts
Re: Invalid postback or callback argument.
Jan 29, 2007 11:48 AM|jtoth55|LINK
http://tothsolutions.com
http://www.sportsalert.com
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1 Points
22 Posts
Re: Invalid postback or callback argument.
Feb 02, 2007 02:11 PM|kdn102|LINK
Hi all, I have a completely different scenario, but I get the same message. I have a page that has a Wizard control on it. I get the error after these steps:
If I then click on the wizard's next button I get the aforementioned error. I am not doing any data binding on this page. I do have some javascript involved. Wizard step 1 updates some dollar amount fields based on an input field, it's called from OnKeyUp and also in the pages startup.
Obviously this is not the normal flow. However, the user can, and in all likelihood will, do this at some point. What I would like to know is, in my situation, is there any way to prevent this? Some other facts that may be helpful:
I have considered giving up on the wizard control and just hiding/showing the user controls & buttons myself. I will try this while I wait for some kind soul to help me out :-)
Thanks in advance!
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1 Points
22 Posts
Re: Invalid postback or callback argument.
Feb 02, 2007 04:06 PM|kdn102|LINK
This yields identical results (I'm not suprised).
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1 Points
22 Posts
Re: Invalid postback or callback argument.
Feb 05, 2007 01:10 PM|kdn102|LINK
The problem was AJAX, sort of. Never put a Wizard in an UpdatePanel is the moral of my story.
Member
130 Points
542 Posts
Re: Invalid postback or callback argument.
Feb 05, 2007 03:09 PM|jwadsworth|LINK
The browser back button is always an ongoing issue for web developers. I'm successfully using the wizard control with a radAjaxPanel (Telerik.com). It works for me, however, I hadn't considered the back button in the particular application. I'll need to look at that now.
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0 Points
12 Posts
Re: Invalid postback or callback argument.
Feb 15, 2007 05:24 PM|kbrownnd97|LINK
Hi,
I am getting this error in a WebControls.Calendar control when I click the "next month" link too quickly one after the next. For example, if I click "March" and then the page seems to load but I click "April" really quick (possibly before the page finishes something?), sometimes the error appears. It's definitely intermittent, and doesn't ever seem to appear if I go slowly through the various months (which do cause postback each time in order to load the data for the given dates).
Here's my stack trace:
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0 Points
1 Post
Re: Invalid postback or callback argument.
Feb 22, 2007 01:00 AM|lmalloy|LINK
Hi,
I came across something similar when trying to get my GridView1 pager label, lblPager, to display a view all link along with the normal paging. I found this link that solved my problem. I also included the solution from the link as well. Hope this helps. I replaced the "Select$" with "Page$" and "findGrid" with "GridView1"
http://www.velocityreviews.com/forums/t115194-sample-usage-of-clientscriptmanagerregisterforeventvalidation.html
Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)
If findGrid.Rows.Count > 0 Then
For Each row As GridViewRow In findGrid.Rows
If row.RowType = DataControlRowType.DataRow Then
row.Attributes.Add("onclick", Page.ClientScript.GetPostBackEventReference(findGrid, "Select$" & row.RowIndex, True))
End If
Next
End If
MyBase.Render(writer)
End Sub
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0 Points
4 Posts
Re: Invalid postback or callback argument.
Mar 22, 2007 12:44 PM|babbellus|LINK
Hello,
Recently, I have the same problem on a page.
As zhouyuheng, i think that disable enableeventvalidation is not the response because
1- it's necessary in certain case
2- the probleme is not the eventvalidation, but the code_behind of caller page.
this error occured when datas load in OnLoad sub are updated by the user.
When the page is reloaded, datas are not the same and can cause a eventvalidation error.
in my case, change the onload code was the answer. i load datas in OnPreRender.
however, when loading datas in onLoad is require, i don't see how do it
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0 Points
4 Posts
Re: Invalid postback or callback argument.
Mar 22, 2007 12:46 PM|babbellus|LINK
Hello,
Recently, I have the same problem on a page.
As zhouyuheng, i think that disable enableeventvalidation is not the response because
1- it's necessary in certain case
2- the probleme is not the eventvalidation, but the code_behind of caller page.
this error occured when datas load in OnLoad sub are updated by the user. When the page is reloaded, datas are not the same and can cause a eventvalidation error.
in my case, change the onload code was the answer. i load datas in OnPreRender.
When loading datas in onLoad is require, i don't see how do it
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64 Points
197 Posts
Re: Invalid postback or callback argument.
Mar 25, 2007 07:24 AM|degt|LINK
Is this a bug that was never fixed? I am using .NET 2.0 (not a beta) with the Web Developer Express 2005 and get the same exception with my language drop down box that I placed on the Master Page. If I do not enable postback nothing happens but then it does not work as (naturally). If on the other hand I enable Postback for the control then it craps out with the exception shown earlier in this thread.
Out of curiosity (before reading the rest of the thread) I used the RegisterClientScriptForValidation(this.DropDownLanguage.UniqueID) but it did not work either. I tried on both OnPreRender and Render.
So basically the last Localization example on quickstars.asp.net does not work (I checked everything already)
localization postback
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64 Points
197 Posts
Re: Invalid postback or callback argument.
Mar 25, 2007 07:58 AM|degt|LINK
So according to this post ASP.NET considers itself malicious :-)
Now, I have the same problem when trying to use the language localization example in a master page. The DropDown list is populated in Page_Load just as in the example. But as soon as I select an option in the drop down I get the exception named in this thread.
I have found no way to overcome this problem and I don't want to disable the event check because this is in a master page used all over the site. In this case converting it to HTML select does not do the trick because I need to postback the selection to the server.
So, if anybody wants to replicate it, go to quickstarts.asp.net, look under Internationalization and fetch the last example of Localization in which the language is selected by means of a drop down. Of course this assumes you only have a single page, put it in a master page and your problems begin.
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0 Points
2 Posts
Re: Invalid postback or callback argument.
Mar 26, 2007 02:10 AM|saquib|LINK
I was getting an error Invalid Postback or Callback.I put the following in web.config
<pages enableEventValidation="false" validateRequest="false"/>
but still m getting the same error...Can anyone help?
Actually My page is having two dropdown one for region and other for activity.If I donot select any activity(i.e. all activity) the error fires however same thing doesnot happen If I select an activity from the dropdown
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0 Points
2 Posts
Re: Invalid postback or callback argument.
Mar 26, 2007 02:10 AM|saquib|LINK
I was getting an error Invalid Postback or Callback.I put the following in web.config
<pages enableEventValidation="false" validateRequest="false"/>
but still m getting the same error...Can anyone help?
Actually My page is having two dropdown one for region and other for activity.If I donot select any activity(i.e. all activity) the error fires however same thing doesnot happen If I select an activity from the dropdown
Member
1 Points
7 Posts
Re: Invalid postback or callback argument.
Mar 27, 2007 10:27 AM|drifter2007|LINK
I started getting this error today after I pasted some new controls and code into a web form. Whenever I clicked on a button on the page I got the error.
The databound controls on my page were being populated as part of Page_Load. When the button on my page is clicked I do not need the databound controls to be rebound automatically in Page_Load so I put in the line,
As soon as I did this, the validation error stopped occurring.
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0 Points
1 Post
Re: Invalid postback or callback argument.
Apr 10, 2007 08:24 AM|mkeeble|LINK
I felt after finding the solution to my problem in this thread, that I ought to post my experiences with this problem.
Mine were particularly baffling as my form's validation would work without issue in Firefox (2.0) but NOT in IE7. I had 3 text fields that perform very simple (is there something or isn't there) validation on each of them. The first field is required, the 2nd two are optional but at least one of them must be completed.
My first field (the required one) would validate correctly every time, but as soon as I tried to force an error in the 2nd two fields (by leaving them empty) I would receive the error page in IE7 when in Firefox the form would validate (or not) as expected.
Adding the EnableEventValidation="false" statement to the Page declaration in my ASPX file, caused the problem to go away. Everything validates and works as expected in all browsers. I have to be honest though, I still have no idea what caused the browser specific error pages and ABSOLUTELY no idea as to why turning OFF event validation would not only fix the error but still allow my validation events to fire. If anyone has any updates on this, I'd be interested to read them.
Thanks to everyone on this thread over the past 2 years though - Probably wouldn't have fixed this so quickly without you all. Cheers,
Matt
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0 Points
4 Posts
Re: Invalid postback or callback argument.
Apr 25, 2007 08:13 AM|esteewhy|LINK
Thank you Ken. the nested <form/> was exactly my problem.
For some reason client-side JS is not submitting __EVENTVALIDATION field back to the server in MSIE in such situation. (However, everything works fine in Mozilla). This problem can be easily diagnosed by examining HttpContext.Current.Request.Form collection sometime early in the page's lifecycle, for instance in InitializeCulture() override ..
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130 Points
542 Posts
Re: Invalid postback or callback argument.
Apr 26, 2007 11:18 PM|jwadsworth|LINK
Maybe this has already been mentioned in this thread, but leaving Debug=True in the web.config can cause Invalid Postback errors. See my post here: http://www.jeremywadsworth.com/Default.aspx?blogentryid=49
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0 Points
1 Post
Re: Invalid postback or callback argument.
May 09, 2007 03:32 PM|Identekit|LINK
Hello,
I found this post while looking for a solution to this same type of issue. In my case I would receive the invalid postback error when I updated a DropDownList (someListDDL) that was also a trigger for an UpdatePanel. It seemed that is my case the only available option was to add the @ Page EnableEventValidation="false" but that seemed to only got me so far. The error message was gone and the SelectedIndexChanged event was fired but nothing was happening. When I debugged the page line by line it turned out that the DropDownList I updated wasn't passing it's selected value anymore. By switching from someListDDL.SeletedValue to Request["someListDDL"] I was able to get the selected value. So far this seems to be completely MS AJAX compatible.
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0 Points
1 Post
Re: Invalid postback or callback argument.
Jun 05, 2007 11:54 AM|Bruised Forehead|LINK
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0 Points
1 Post
Re: Invalid postback or callback argument.
Jul 10, 2007 10:02 AM|webdfw|LINK
Good morning from Texas.
jtoth55 nailed it for me.
In my master page inherited content, I would get the same error this thread is about. I created a blank page, added a button control and it worked fine.
After further review of my master page, I found that the search block, I um, borrowed from another site had been wrapped in a form tag. The orginal site was all html. As soon as I removed the duplicate form tag from my master page, all my postbacks went back to working as advertised.
Thanks for the help!
Bill Deihl
Member
215 Points
123 Posts
Re: Invalid postback or callback argument.
Jul 12, 2007 12:26 AM|Natural Cause|LINK
I just spent the better part of an hour trying to resolve the same issue.
All my pages are .html pages
I have javascript to make pages post back to .html (since i can't change the form action from .aspx to .html)
What was trying to do was populate a Repeater, and then have a button for each item. This is for a shopping cart. Everything displayed fine, i populated the repeater, had an ItemDataBound to populate each Item/AlternatingItem, which all had a Button in it.
When a button was clicked it threw that error.... the problem was i was doing the DataBind in the Page_Load(), so when the page posted back it was Binding again so there was no data for the ItemCommand.
I resolved the issue by change Page_Load() to Page_PreRender().
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0 Points
1 Post
Re: Invalid postback or callback argument.
Jul 19, 2007 09:49 AM|saboorgee|LINK
I have face the same problem i search on the net i find some thing but i not exectly find the solution i find that if we call this function with these parameter then this error never occour
Page.ClientScript.RegisterForEventValidation (PostBackOptionObject)
or
Page.ClientScript.RegisterForEventValidation (String)
or
Page.ClientScript.RegisterForEventValidation (String ,String)
if we register these method at render prerender of the form then this problem solved
this is the post back option object
http://msdn.microsoft.com/en-us/library/system.web.ui.postbackoptions.validationgroup.aspx
Access is denied ASP.NET 2.0 ASP.NET 1.1 Migration Web Application Projects error User control System.Security User.IsInRole ASP.Net 2.0
Member
1 Points
47 Posts
Re: Invalid postback or callback argument.
Aug 09, 2007 10:29 AM|priccopricco|LINK
@TimBailey99:
It seems I encontered th same problem...
Do you think should be possible to move the "__EVENTVALIDATION" hidden field at the top of the form? just after
we should use the same technique used to move the viewstate hidden field at the end of page (the one used in DotNetNuke).
In this way should be impossible for a user to submit the form before the eventvalidation field has been loaded...
What do you think about this?
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0 Points
1 Post
Re: Invalid postback or callback argument.
Aug 11, 2007 01:14 AM|teoh_s|LINK
Actually, it would be a lot lot lot easier if you could just use HTMLSelect instead of DropDownList. It solves my problem.
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0 Points
11 Posts
Re: Invalid postback or callback argument.
Aug 11, 2007 08:01 AM|Jitendra R Wadhwani|LINK
Hi All.....
The problem is relatively simpler.
Problem : Invalid postback or callback argument.
Scenario: Creating composite controls, which implements INamingContainer--Interface.
Explanation/Reason for the problem: 1.) Real Reason lies in the dynamic generation of id's for the various composite controls being used.
2.) Currently, though, you are implementing, the INamingContainer--Interface, and plus, even the frameworkalso asists, in generating the dynamic id's of the controls created on the web-page, while creating custom/user controls we often need to generate the ids of the controls getting created. Specially, to determine the position of the controls to get that control, on any postback.
3.) Now while dynamically generating these id's, if in case, you are generating the "SAME ID -- FOR 2 CONTROLS -- say for example -- the linkbuttons -- " the framework will not be able to catch it at the compile time.
4.) But during the next post-back of/on the same control, the framework/compiler, knows that there are two controls with the same id on the page, and this is wrong from the point of view that you are using two controls with same id on the page though you are implementing the INamingContainer--Interface, and even the .net framework doesnt allow this.
5.) Hence you get the error message for this -- "Invalidpostback or callback argument".
6.) Also, since there are two controls on the page, with the same id, the framework, is not able to determine the values of __EVENTTARGET and __EVENTARGUMENT.... these will hold values null.
7.) If u debug...it might let u debug till page_load end statement, but after this instead of passing the control to the event handler u will receive the "Invalidpostback or call back argument".
SOLUTIONS: 1.) Make for these controls EnableEventValidation as false.
2.) At the page level also, u can mention EnableEventValidation as false.
3.) At the whole application level, i.e in the web.config also, u can specify EnableEventValidation as false.
4.) All these will harm the security of your application and your machine -- I strongly "dont" recommend this.
5.) Best Solution -- Where you are generating the id's for the controls -- dynamically -- for eg, say -- txtBoxUser = this.Id + " _1" + _txtBox"; check such scenarios -- becoz it is somewhere here where you are generating the similar id's of the controls.
6.) Debug to find this .... the unique ids getting generated. Take care of for loops wherein sometime, the counter's of for loops are the only differentiators for generating the ids of the controls dynamically --typical example -- to determine the row position.
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0 Points
11 Posts
Re: Invalid postback or callback argument.
Aug 11, 2007 08:07 AM|Jitendra R Wadhwani|LINK
Hi ...
Please "do not" set enableEventValidaton to false.
You are actually playing with the security of your site, and the machine.
Instead check this -- 1.) Are you dynamically generating the ids of the controls on the page.
2.) If yes, please check if somewhere, somehow, two controls are getting the same id... it can be even two empty literals just used for spacing.
3.)If so, the compiler doesnt catch this at run time.... and on the next post back you get this error.
None
0 Points
11 Posts
Re: Invalid postback or callback argument.
Aug 11, 2007 08:11 AM|Jitendra R Wadhwani|LINK
I am damn sure that your buttons are getting generated with the same id's, in case if you are generating the id's for them.
Or it can be any of the atleast two controls on the page.... with the same id...even say two empty literals used just for the spacing UI needs.
Once two control's with the same id are there.... framework cannot determine which control actually triggered the postback.
__EVENTTARGET and __EVENTARGUMENT will get null values.
Hence the error.
None
0 Points
11 Posts
Re: Invalid postback or callback argument.
Aug 11, 2007 08:16 AM|Jitendra R Wadhwani|LINK
Also please take a note that...
"IT CAN BE EVEN SAY TWO EMPTY LITERALS JUST USED FOR SPACING EFFECTS IN UI" that are getting generated with the same id.
The point is any of atleast two controls on the page will have same id's.
And framework is not able to determine which one, initiated the postback and terms it invalid.
Hence even the exception says -- "Invalidpostback".
Please do not set "EnableEventValiation" and validate to false.
These are too important from security point of view.
None
0 Points
11 Posts
Re: Invalid postback or callback argument.
Aug 11, 2007 08:21 AM|Jitendra R Wadhwani|LINK
Hi All....
The problem is relatively simpler.
Problem : Invalid postback or callback argument.
Scenario: Creating composite controls, which implements INamingContainer--Interface.
Explanation/Reason for the problem: 1.) Real Reason lies in the dynamic generation of id's for the various composite controls being used.
2.) Currently, though, you are implementing, the INamingContainer--Interface, and plus, even the frameworkalso asists, in generating the dynamic id's of the controls created on the web-page, while creating custom/user controls we often need to generate the ids of the controls getting created. Specially, to determine the position of the controls to get that control, on any postback.
3.) Now while dynamically generating these id's, if in case, you are generating the "SAME ID -- FOR 2 CONTROLS -- say for example -- the linkbuttons -- " the framework will not be able to catch it at the compile time.
4.) But during the next post-back of/on the same control, the framework/compiler, knows that there are two controls with the same id on the page, and this is wrong from the point of view that you are using two controls with same id on the page though you are implementing the INamingContainer--Interface, and even the .net framework doesnt allow this.
5.) Hence you get the error message for this -- "Invalidpostback or callback argument".
6.) Also, since there are two controls on the page, with the same id, the framework, is not able to determine the values of __EVENTTARGET and __EVENTARGUMENT.... these will hold values null.
7.) If u debug...it might let u debug till page_load end statement, but after this instead of passing the control to the event handler u will receive the "Invalidpostback or call back argument".
SOLUTIONS: 1.) Make for these controls EnableEventValidation as false.
2.) At the page level also, u can mention EnableEventValidation as false.
3.) At the whole application level, i.e in the web.config also, u can specify EnableEventValidation as false.
4.) All these will harm the security of your application and your machine -- I strongly "dont" recommend this.
5.) Best Solution -- Where you are generating the id's for the controls -- dynamically -- for eg, say -- txtBoxUser = this.Id + " _1" + _txtBox"; check such scenarios -- becoz it is somewhere here where you are generating the similar id's of the controls.
6.) Debug to find this .... the unique ids getting generated. Take care of for loops wherein sometime, the counter's of for loops are the only differentiators for generating the ids of the controls dynamically --typical example -- to determine the row position.
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Aug 17, 2007 11:39 AM|moges|LINK
If you use Button control instead of linkButton. You will not have this error.
you can keep page EnableEventValidation true.
Member
3 Points
45 Posts
Re: Invalid postback or callback argument.
Aug 20, 2007 10:11 AM|row118|LINK
I was getting an error Invalid Postback or Callback.
I had forgotten to put PopulateRepeater routine in the IsNotPostback logic.
Member
608 Points
174 Posts
Re: Invalid postback or callback argument.
Aug 28, 2007 07:46 AM|GavDraper|LINK
I like many people am getting this error, I've had a read through most of this thread and just want to clarify there is no solutions for what im doing other than turning of event validation.
I have 2 drop down boxes, when you select an item in drop down 1 I use my own Ajax calls to populate drop down 2 with items from a database. I'm not using the MS Ajax framework and I dont want to if I can avoid it. As soon as a postback occurs after this I get the error. Are there any workarounds other than disabling this validation? Just turning it off for the page isnt really an option either as I use user controls and this 1 page is used with many different user controls depending on what the user requested so in effect this 1 page is actaully about 20 different pages.
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Aug 30, 2007 02:49 AM|manishahowale|LINK
The error is :
System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.ArgumentException: Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. Resolution : Remove the <form> tag from content form which has implemented master page. Since, master page also have <form> tag. The two <form> tag makes an error.
ASP.Net 2.0
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Sep 02, 2007 05:17 AM|europaulo|LINK
If your problem is having a dynamic dropdownlist, populated by AJAX or Javascript code, prepolulate this list with all possible values (must be unique!). This way your dynamic code can filter the list values (i.e. based on selected value in another dropdown list) and that will not cause a invalid postback. And you won't need to disable event validation!! Hope this helps ;-)
dropdownlist javascript ajax asp.net RegisterForEventValidation
None
0 Points
9 Posts
Re: Invalid postback or callback argument.
Sep 03, 2007 10:33 AM|raja37pn|LINK
I toohaving same problem what you people were had.... Can anyone solve this problem without changing enableEventValidation
to false... Since that will cause some security problem in entire application or page. Suppose we are working some big projects means, this solution wont be goood, by changing eventvalidation to false may cause some other problem....
So please anyone find out the better solution for this... If found I will also share with you...
Thanks
Raja
P.N.Raja,
.NET Developer.
None
0 Points
8 Posts
Re: Invalid postback or callback argument.
Sep 05, 2007 06:21 PM|aureolin|LINK
Fantastic! This solution worked for me! My problem was related to having hidden fields on my form. I do not have any "duplicate ids" or duplicate "form" tags. If the hidden fields are in the form - problem exists. Comment them out, problem goes away - but then my form didn't work. Go figure.
Anyway - Thanks again, your solution saved the day! [:)]
Steve G.
None
0 Points
5 Posts
Re: Invalid postback or callback argument.
Sep 13, 2007 03:01 PM|es968mj|LINK
OK, Let me see. If I understand what you're saying. The reason I'm getting the error is becuse I have placed a control(in this case RadioButtonlist) onto a masterpage and I have created two pages with this masterpage. The radio buttons work fine on the first page but not on the second because of the ID. I now have two controls with the same name. Is this correct?
If so how do I resolve this issue with setting the enableEventValidate to fales. Which for me is not an option.
OK, well after looking thru the code once more. I had a form tag on the page attached to the masterpage. This page is comments/sugguestion page which I need the form tag so the users can submit the form. or is there a better way?
I new to this stuff and I'm getting very confused....
None
0 Points
3 Posts
Re: Invalid postback or callback argument.
Sep 25, 2007 09:25 PM|luwina|LINK
try this site... i copied the code-behind and it worked...
postbacks really gives me headache before this
http://www.ajaxium.com/ajax-eliminate-postbacks.aspx
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Sep 26, 2007 04:19 AM|lisnter|LINK
Just a note. I had this problem on a page with a mix of asp:Panel and AJAX UpdatePanels. I was very confused because my proof-of-concept page worked fine but when I incorporated things into my main page I started having this problem. Anyway, I am moving toward UpdatePanels in the overall site but haven't finished so there are some of both. I'm sure you know where this is going. . . After fiddling with things for a while I thought to change the few UpdatePanels to vanilla Panels. Problem went away.
Hope this helps someone
T.
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Oct 04, 2007 09:11 PM|mitch_1979|LINK
I just had an experience with a similar problem.
I have a page that creates an asp:imagebutton for each item (row) in a datagrid.
I had made a mistake and I was binding the datagrid at every Page_Load. When the imagebutton click event fired and do a postback, the page would reload and rebind the button. I presume ASP was detecting that the imagebutton created during databind shared the same ID as the button doing the postback and throwing this Invalid postback error.
Problem resolved by only binding the datagrid at Page_Load if the page is NOT a Postback.
i.e. the familiar...
If NOT Page.IsPostBack() Then
Domydatagrid_databind()
End If
None
0 Points
3 Posts
Re: Invalid postback or callback argument.
Oct 15, 2007 06:22 AM|shail.patil@gmail.com|LINK
Thanks !! [:)]
i solve this problem throgh EnableEventValidation ="false"
None
0 Points
10 Posts
Re: Invalid postback or callback argument.
Oct 18, 2007 02:34 AM|aayamsingh|LINK
This unual thing happened with me also.I also received my error suddenly.
I had .Net 1.1 and .Net 2.0 on my machine and i confiugured an IIS application and started accessing it.It worked fine for some time but after a particular navigator it used to crash with this error logged.Just while debugging the problem i opened the property page for my IIS application and looked in the ASP.NET tab and there it was set to 2.0.xxxx version.But how is my Asp.net 1.1 application running fine.It should have given some coonfiguration error in web config atleast.When i actually changed it to 1.1.xxxx My application started behaving fine.
Didnt get time to look into how was few on my pages where eally displayed and what was the stuff that was actually causing the crash.But what is the harm in giving it a try ,who know it may work for you also.
Regards,
Aayam
None
0 Points
8 Posts
Re: Invalid postback or callback argument.
Nov 02, 2007 11:47 AM|BCandy|LINK
I am having the same problem. This post is old, so I assume some of you may have the solution. Please let us know, thanks.
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Nov 06, 2007 10:38 AM|Saint Hannibal|LINK
I'm getting the same error. But mine happens on a page that has a DataList that has a button for each row, the button is to open a pdf file.
My site works fine for firefox but i get the error while viewing it in IE.
I've tried a couple of the fixes given in this thread, but none have helped yet. If any one can help me out that would be great. Thanks [:)]
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Nov 06, 2007 04:45 PM|Saint Hannibal|LINK
Well i didn't get it to totally work, but i changed my button to a hyper link and it works fine in IE now.
Participant
777 Points
329 Posts
Re: Invalid postback or callback argument.
Nov 07, 2007 07:03 AM|Spanco|LINK
After lot of R and D I didnt find the solution except
EnableEventValidation="false"
and this is final from my side
Pradeep Bisht
BLOG ::--> http://dotnetarmy.blogspot.com/
URL ::--> http://www.asp.net
Member
11 Points
17 Posts
Re: Invalid postback or callback argument.
Nov 07, 2007 08:11 AM|kgreen|LINK
As many people have said before, disabling Event Validation is tantamount to laying down a doormat welcoming XSS attacks. I still haven't found a solution, although I keep looking from time to time.
Member
10 Points
210 Posts
Re: Invalid postback or callback argument.
Nov 08, 2007 12:43 PM|boyd5|LINK
Personally,
For me, at least, this problem was caused because I was updating a control outside of the updatepanel, which in turn, caused this error to come up. In one case, I was changing the visibility of a control outside of the updatepanel, but the control was still visible. Then when I clicked on any control within said user control, this error would pop up.
Maybe that'll get you thinking in a different direction.
Systems Architect
None
0 Points
21 Posts
Re: Invalid postback or callback argument.
Nov 09, 2007 02:36 PM|lordofthexings|LINK
removed the form tag and head tag from the user control, the problem is gone
I don't know the relation
Thanks !
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Nov 26, 2007 10:48 AM|LizMit|LINK
http://forums.asp.net/t/1144649.aspx thread gives a good solution to this .
cheers
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Dec 28, 2007 08:34 AM|sweKbr|LINK
I had a problem with invalid postback or callback argument related to a datagrid after a .net 2.0 upgrade and MasterPage implementation. The datagrid is located in a user control and i tried with changing it to a gridview, setting the validation to false and so forth but eventually it turned out that a DataBind in the MasterPage page_load was the cause. So a (!isPostback) check before the databinding in the MasterPage fixed the problem for me. It actually caused some other pages to stop function correctly so i also implemented a check if this specific page is loaded then the (!isPostback) is runed.
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Jan 11, 2008 07:26 AM|Philcz|LINK
I just wanted to thank you for this piece of advice, it helped a lot :) thx
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Jan 22, 2008 02:30 PM|anthony_h|LINK
I also had the same issue - in my case due to adding controls in code behind without an ID > id was autogenerated and when the control was replaced by another one they got the same id throwing that error.
After giving id to all controls pb solved
None
0 Points
5 Posts
Re: Invalid postback or callback argument.
Jan 23, 2008 11:18 AM|Sinkaidas|LINK
I was also having the same problem using nested master pages. It looks like if the nested master page has the <form> tag in it anywhere, this error will be produced. As soon as a removed the <form> tag from the nested master page, all was well.
Member
1 Points
4 Posts
Re: Invalid postback or callback argument.
Feb 19, 2008 10:43 AM|Swifty|LINK
Hi
I HAD the same error and spent hours googling the the problem before solving it.
I found solutions like disabling the .net 2.0 validation in your <%page> tag, the registerID aswell.
After pondering on this one for a while and reading anthony_h's post, i got a light bulb going off.
All (or most of) the problems people where having had something to do with IDs when programtically adding controls
and were fixed as before mentioned or replacing the controls with others (ie dropdown with htmlselect ect.), these errors
seemed to occur randomly. I believe this is not the case. I am creating a user control to view tiffs. I had to start from
scratch a few times, but we programmers are a lazy breed, this is where copy and paste comes into play, and along
with it, the friend we all seem to have in common: "Invalid postback or callback argument".
I believe the IDs get messed up when you copy and paste controls across solutions either through the design view or
coping the actual code. I simply had to recreate all my buttons and dropdown lists and the error was gone.
Thats it, please let me know if my post was helpfull
Neil
Junior C# Developer
None
0 Points
14 Posts
Re: Invalid postback or callback argument.
Feb 25, 2008 07:23 AM|Phr34ker|LINK
In my case it originated from having a <form>-tag inside the <form runt="server">-tag - an old relic from an old HTML-page that taged along. Now, this doesn't apply to a Custom Control, but it might be the page he inserts the Custom Control on that has the same HTML-bug, in which case the control will fail.
Member
11 Points
28 Posts
Re: Invalid postback or callback argument.
Mar 25, 2008 09:42 AM|Mr Baldman|LINK
I have deployed this fix on 2 of my major sites - works a treat.
Thanks to retox
Member
71 Points
77 Posts
Re: Invalid postback or callback argument.
Apr 01, 2008 06:25 AM|julesr|LINK
Bizarrely, the code below generates the infamous callback error when 2 is selected from the list. Removing vbcrlf from the code 'fixes' it.
<%@ Page Language="VB"%>
<script runat="server">
Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
Dim Arr As String() = {1, 2 & vbCrLf, 3}
DropDownList1.DataSource = Arr
DropDownList1.DataBind()
End Sub
</script>
<form runat="server">
<asp:DropDownList ID="DropDownList1" runat="server"/>
<asp:Button ID="Button1" runat="server" Text="Submit" />
</form>
Charon.co.uk
Member
70 Points
11 Posts
Re: Invalid postback or callback argument.
Apr 03, 2008 04:40 PM|Shodan240z|LINK
I've used this on pages *with* ajax, and it works perfectly there as well.
Thanks so much for this!
Set a man on fire and he'll stay warm for the rest of his life."
None
0 Points
2 Posts
Re: Invalid postback or callback argument.
Apr 04, 2008 04:00 AM|niranjan2u|LINK
Hi,
I also have the same problem. I have no problem if the button is clicked when the page is fully loaded in the browser. But if clicks when the page is loading, getting the same exception. I have used the clientscript.RegisterForEventValidation, not resolved my problem. Help me out of this.....
None
0 Points
5 Posts
Re: Invalid postback or callback argument.
Apr 21, 2008 05:35 AM|UydurukAdres|LINK
I had that problem in a page that contained a gridview component which had a datasource filtered according to a parameter obtained from querystring. If i used postback check method in form load event to disable duplicate databinding then all data in table was listed when i clicked Edit, Cancel, Update, Delete buttons in any row as no filter was being applied when the form was reloaded.
I solved that problem using these steps:
In other words i ran the code to recreate SQL statement for data source using querystring parameter and rebind gridview under above listed events.
I hope this helps people who is changing datasource during run-time and having that silly problem.
Yalin Meric
Software Projects Coordinator
Ebit Informatics Inc.
www.e-bit.com.tr
Participant
1044 Points
360 Posts
Re: Invalid postback or callback argument.
Apr 25, 2008 09:02 AM|mvang|LINK
This is a good article covering this problem:
http://odetocode.com/Blogs/scott/archive/2006/03/20/3145.aspx
— Margaret Fuller
Member
1 Points
5 Posts
Re: Invalid postback or callback argument.
Apr 25, 2008 10:10 AM|s.foschi|LINK
Invalid postback or callback argument. Event validation is enabled using <PAGES enableEventValidation="true"></PAGES>in configuration or <%@ Page EnableEventValidation="true" %>in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation.
and in my case i came to the conclusion that was a logical error in my code.
I was trying to do this :
Protected Sub dtaLingue_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataListCommandEventArgs) Handles dtaLingue.ItemCommandSession(
"idLingua") =Trim(CType(e.Item.Controls(2), Label).Text)End Sub
but in my case, the correct way is this one: Protected Sub dtaLingue_ItemCommand(ByVal source As Object, ByVal e As System.Web.UI.WebControls.DataListCommandEventArgs) Handles dtaLingue.ItemCommand
Session("idLingua") = Trim(CType(CType(CType(source, DataList).Controls(1), DataListItem).FindControl("lblIdLingua"), Label).Text)
End Sub So i came to the conclusion that one of the reasons of this error is also an incorrect logic in the application.
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Apr 25, 2008 11:49 AM|jimmjobs|LINK
Mine was an extra FORM tag.... check for this doh!
Participant
1044 Points
360 Posts
Re: Invalid postback or callback argument.
Apr 25, 2008 01:06 PM|mvang|LINK
My problem relates to the article that I posted earlier where I was attempting to add a value from client script to an asp drop down control in which the application thinks I am performing an injection attack. My question is, if I create a custom drop down control and called it namespace MyDropDownControl, if I leave out the attribute [SupportEventsValidation] can and will my control override that portion of the dropdown?
The reason for me asking is because I don't want to diable the page event validation but the solution was to register my value to the control upon Render, in which I can only do that if the value was already known. In my case, it's whatever value the user will enter and add. Therefore, if it is possible, my class will disable the event validation for just that instance of my class rather than the whole page. Any comments, suggestions, or knowledge about this?
Thanks everyone! :)
— Margaret Fuller
None
0 Points
24 Posts
Re: Invalid postback or callback argument.
Apr 27, 2008 10:10 AM|Ensonix|LINK
I was encountering this problem when users were clicking on links or buttons before the page had finished loading, then I finally found this blog post http://blogs.msdn.com/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx
Solution 3 on this page solved the problem for me, moving the EVENTVALIDATION field to the top of the page.
Ryan
eventvalidation
Member
1 Points
56 Posts
Re: Invalid postback or callback argument.
Apr 30, 2008 03:30 AM|dbrook007|LINK
I have been receiving this error:
" Invalid postback or callback argument. Event validation is enabled using in configuration or <%@ Page EnableEventValidation="true" %> in a page. For security purposes, this feature verifies that arguments to postback or callback events originate from the server control that originally rendered them. If the data is valid and expected, use the ClientScriptManager.RegisterForEventValidation method in order to register the postback or callback data for validation. "
This has only been experienced by users who have been using the website whilst the same page has been updated. It has been reported occasionally during busy times too. The problem arises from a asp.net 2.0 drop-down control that is in an Ajax Update Panel (i.e., when a user selects an item from it). But, it only occurs in the scenario I have described.
This occurs usually from users using Firefox, though it has occurred sometimes with IE7 users. However, I can only recreate the problem in Firefox.
I've tried a number of possible solutions using the ClientScriptManager.RegisterForEventValidation, but none have solved this problem. Changing <%@ Page EnableEventValidation = "false" %> has temporarily solved the problem, but I don't really want this solution long term.
The project is an ASP.Net 2.0 AJAX enabled website. It uses masterpages.
Any help on this appreciated.
Thanks - Darren
Code behind choices Web Application Projects Web.config allowDefinition MachineToApplication solution Web Application Projects error Session state ATLAS AJAX Cascading Dropdown Combobox AutoPostBack ScriptManager Focus Preserve Mantain PostBack DropDownList ASP.Net 2.0 dropdownlist javascript ajax asp.net RegisterForEventValidation UnHandledException causing CLR to terminate ASP.Net page_load Attempted to read or write protected memory. This is often an indication that other memory has been corrupted web deployment projects 2.0 javascript eventvalidation
e: darrenbrook@btconnect.com
None
0 Points
12 Posts
Re: Invalid postback or callback argument.
May 06, 2008 12:01 PM|raddrick|LINK
=D
TY!!!!
System Developer
None
0 Points
1 Post
Re: Invalid postback or callback argument.
May 20, 2008 11:14 PM|Khushi.net|LINK
Thanks for this post, u r a life saver. i have been getting this error "invalid postback or callback argument & blah blah......" ever since i migrated my code from asp.net 1.0 to asp.net 2.0. by this time i was in complete frustation because i had tried everything found on the net like setting 'enableeventvalidation' to false in page directive & check which control was giving the error but nothing seemed to be working. The funny thing was same code was working well for other screens & that made me curious until i read ur post.
I forgot to check in my page load that i was actually binding the data to the grid on postback inside the page load event. thanks a lot for this [Idea]
For those having the same error on postback with or without a popup on ur page please make to check for postback before u bind the data to the grid.
if !page.ispostback then
grid.databind()
end if
I hope this thread helps to everyone who are receiving this error at any time in their code.[Yes]
Member
10 Points
6 Posts
Re: Invalid postback or callback argument.
May 29, 2008 08:49 AM|ketan patel|LINK
To Solve This Problem What You Have to Do Just Write Following Code in Web.Config. system.web> Doing this One It’s Solve Your Problem But It’s Effect On Your Site Security. Basically EnableeventValidation of asp.Net pages are ture.Wich Prevent Injection Attack.Make it’s False Involve This Injection Attack.
http://webaspdotnet.blogspot.com/
None
0 Points
1 Post
Re: Invalid postback or callback argument.
May 29, 2008 01:29 PM|Stevenzook|LINK
Thank you Alle!
You solved my problem with this exception! All i had to do on my <asp:GridView> was set enableViewState="false" and suddenly that ugly error went away!
I admit to being new to C# and these little things really get me pulling my hair out.
-Steven
None
0 Points
3 Posts
Re: Invalid postback or callback argument.
Jun 07, 2008 03:05 AM|mangokun|LINK
http://aspnet.4guysfromrolla.com/demos/printPage.aspx?path=/articles/122006-1.aspx
Public Overrides Sub VerifyRenderingInServerForm(ByVal control As Control)
'###this removes the no forms error by overriding the error
End Sub
Public Overrides Property EnableEventValidation() As Boolean
Get
Return False
End Get
Set(ByVal value As Boolean)
'DO NOTHING
End Set
End Property
http://www.geocities.com/mangokun/
Bring on the black and white
http://www.imdb.com/title/tt0388556/
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Jun 09, 2008 04:57 AM|robinherbots|LINK
Say you have a dropdownlist with items and a listbox which get clientside populated with items you select from the dropdownlist.
The below code solves the invalid postback data. You have to register all possible values the listbox can contain in the render method.
protected override void Render(HtmlTextWriter writer)
{
//register the items from the dropdownlist as possible postbackvalues for the listbox
foreach (ListItem option in _dropDownList.Items)
{
Page.ClientScript.RegisterForEventValidation(_listBox.UniqueID, option.Value);
}
base.Render(writer);
}
Have fun !
ASP.Net 2.0
Member
11 Points
16 Posts
Re: Invalid postback or callback argument.
Jun 17, 2008 09:36 AM|micahs|LINK
I just figured out a solution to my version of this problem. Previously my code worked great in IE, but terribly in FireFox.
1. Removed all <asp:ObjectDataSource> objects from the form and put all databinding in the code-behind.
2. Removed all worthless code in my gridview's pageindexchanging. There was a while when it would only run with the code, but eventually it worked without it.
protected void gvMVisibility_PageIndexChanging(object sender, GridViewPageEventArgs e)
{/*
PopulateMarketVisibility(txtFeeTypeCode.Text);
gvMVisibility.PageIndex = e.NewPageIndex;
gvMVisibility.DataBind(); */
}
Micah
None
0 Points
1 Post
Re: Invalid postback or callback argument.
Jul 07, 2008 11:26 AM|weigh2tall|LINK
I just wanted to confirm that this solution worked for me as well.
Thanks!None
0 Points
8 Posts
Re: Invalid postback or callback argument.
Jul 30, 2008 03:11 PM|atz|LINK
I don't know if this will help you but I used the following solution to fix my problem since I ran into the same situation. I just wanted to pass the info along.
As easy as this may sound, all I did was wrap my page load events inside of a IsPostBack check. On my page_load event, I have a series of binding routines to set up a gridview that exists on my page. This is what I did:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not Page.IsPostBack Then ' My customized gridview setup routines myGridView.Initialize(myCustomParemter) End If End SubAlso, it seems that what was happening in my case was that the gridview rebinding itself in my custom Initialize method was causing the page to validate. In any case, I found this article helpful as well:http://www.beyondweblogs.com/post/Invalid-postback-or-callback-argument-error.aspx
Hope this helps!
2.0 .Net
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Re: Invalid postback or callback argument.
Aug 07, 2008 03:49 AM|blumonde|LINK
UpdateMode
="Conditional" and ChildrenAsTriggers="False" Also, remove all the triggers and this error will go away. Website with ajax enabled will work without specifying the triggers. At first, I did try both setting validation to false and RegisterForEventValidation the calendar but that didn't fix it.Hope that helps.
no pain no gain
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152 Posts
Re: Invalid postback or callback argument.
Aug 12, 2008 01:36 PM|profnachos|LINK
I see that this is working for some people, but not in my case. I do bind dropdowns onload, but always in if(!IsPostBack) so as not to call it twice.
That this happens intermittently, and when it wants to is driving me up the wall. This error on various pages come in waves.
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8 Posts
Re: Invalid postback or callback argument.
Aug 12, 2008 02:54 PM|atz|LINK
Would you mind posting some of the code? The only thing I can think is that something else outside the if(!IsPostBack) is causing the the page to load twice. Perhaps a custom control or operation outside your postback check. Hope that helps some :-).
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Re: Invalid postback or callback argument.
Aug 12, 2008 10:02 PM|gchq|LINK
This one appears intermittently - no rhyme or reason or just one function....
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Re: Invalid postback or callback argument.
Aug 15, 2008 01:53 PM|schellem|LINK
We were seeing these intermittantly and I was finally able to reproduce some by using Fiddler and simulating modem speed. Turns out a postback is being done before the page finishes loading. The hidden __EVENTVALIDATION happens to be about the last stuff rendered on the page so it gets lopped of thus the error.
I found this fix on how to move __EVENTVALIDATION to be rendered earlier http://blogs.msdn.com/tom/archive/2008/03/14/validation-of-viewstate-mac-failed-error.aspx I went to test and have now discovered that some update either NET 3.5, VS 2008 or their SP1's has now caused the EVENTVALIDATION to be rendered much earlier.
Anyway so some of these problems may suddenly go away and here is probably the explanation.
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Re: Invalid postback or callback argument.
Aug 15, 2008 05:35 PM|profnachos|LINK
This is somewhat off topic, but how do you simulate modem speed?
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Re: Invalid postback or callback argument.
Aug 18, 2008 08:19 AM|schellem|LINK
There is an option in Fiddler2 under Rules/Performance - 'Simulate Modem Speeds'. Don't know what speeds it simulates but it will definetly slow you down.
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2 Posts
Re: Invalid postback or callback argument.
Aug 23, 2008 01:59 PM|Firewalker|LINK
I have the same problem with a asp:button that is hooked to an extender I wrote which basically disables it when clicked. I scoured these forums and Google for two days and came up with nothing. The extender has some javascript which changes the buttons text value from "Submit" to "Loading..." once clicked and disables it so it can't be clicked again. I tried the following line of code in the render event I overrode:
Page.ClientScript.RegisterForEventValidation(myButton.UniqueID.ToString());
and it does not work. I even tried:
protected override void Render(HtmlTextWriter writer)
{
PostBackOptions myPostBackOptions = new PostBackOptions(myButton);
//Add the Postback event
if (Page.ClientScript.GetPostBackEventReference(myPostBackOptions).Length > 0)
{
m_Button.CausesValidation = false;
myPostBackOptions.PerformValidation = false;
Page.ClientScript.RegisterForEventValidation(myPostBackOptions);
}
base.Render(writer);
}
but get the same exception. It is weird, it is the the fact that the button is disabled on the client which is causing the error, not the changing of the value in my javascript to "Loading...". If I don't disable the button but still change the text value to "Loading..." it works fine (and without the need to call RegisterForEventValidation()). If you are supposed to pass in a second argument called "parameters " to RegisterForEventValidation what should that argument be if it is the disabled property causing the button to not function? If anyone has the answer to this question it would be greatly appreciated!
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Re: Invalid postback or callback argument.
Aug 23, 2008 05:49 PM|gchq|LINK
FireWalker
Are you disabling the button serverside or clientside? I cured a probem like this by disabling in JavaScript - here's an example:-
vTimer += "function CurrentTime() { " & vbCrvTimer +=
"var now = new Date(); " & vbCr vTimer += "var hour = now.getHours(); " & vbCrvTimer +=
"var minute = now.getMinutes(); " & vbCr vTimer += "var second = now.getSeconds(); " & vbCrvTimer +=
"if (hour < 10) { hour = '0' + hour; }" & vbCr vTimer += "if (minute < 10) { minute = '0' + minute; }" & vbCrvTimer +=
"if (second < 10) { second = '0' + second; } " & vbCr vTimer += "document.getElementById('" & TextBox1.ClientID & "').innerText = hour + ':' + minute + ':' + second; " & vbCrvTimer +=
"document.getElementById('" & Button1.ClientID & "').disabled=true;" & vbCr vTimer += "document.getElementById('" & Button2.ClientID & "').disabled=false;" & vbCrvTimer +=
"}" & vbCrNone
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2 Posts
Re: Invalid postback or callback argument.
Aug 24, 2008 01:21 AM|Firewalker|LINK
gchq
I am disabling on client side in javascript. In my extender js file on the click event handler I have:
this.get_element().disabled = true;
this.get_element().title = this._clickedToolTipText;
this.get_element().value = this._clickedText;
eval(this._postbackReference);
So I basically disable the button on the first line, set the text on the other lines, then to start postback I call eval() passing in the postbackreference string I got by calling ClientScript.GetPostBackEventReference() on the server. Commenting out the first line that disables the button resolves the error, so it is disabling the button that causes the validation to fail.
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Re: Invalid postback or callback argument.
Oct 07, 2008 12:41 PM|extremelogic@hotmail.com|LINK
I was able to resolve this issue by taking GridView's DataBind() statement off from the page load event. I was changing a parameter value of the Gridview datasource at run time and was firing a DataBind command to refresh the grid on the page load.
I moved that statement to the button_click event of search button and it resolved the issue. What I have noticed that if you have a command button in the grid and you try to DataBind in the page load event then it will generate this error.
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Re: Invalid postback or callback argument.
Oct 09, 2008 10:42 AM|hud2000|LINK
I resolved this problem by wrapping my gridview databind in a "if not page.ispostback then .... end if"
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1 Post
Re: Invalid postback or callback argument.
Oct 14, 2008 05:41 AM|robypang|LINK
I would like to ask the following:
my code sameple:
<
body> <form id="form1" runat="server"> <input type="hidden" runat="server" id="txtEnableActiveX" name="txtEnableActiveX"/> <script type="text/javascript"> if ("" == document.all['txtEnableActiveX'].value){
__doPostBack('btnSetCookies','');}
</script> <div> <input type="button" runat="server" id="btnSetCookies" width="1" name="btnSetCookies" /> </div> </form></
body>
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load End Sub Private Sub btnSetCookies_ServerClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnSetCookies.ServerClick
End Sub Protected Overrides Sub Render(ByVal writer As System.Web.UI.HtmlTextWriter)Page.ClientScript.RegisterForEventValidation(btnSetCookies.UniqueID,
"") MyBase.Render(writer) End SubI go the error also, I would not like to set EnableEventValidation="false"
is there anyone can help me to solve the problem?
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2 Posts
Re: Invalid postback or callback argument.
Oct 24, 2008 06:30 AM|david andrews|LINK
the poeple who use my website are getting this invalid postback error as well.
i also can't recreate it so can't do anythign systematically to try and fix it.
what i have noticed though is that in the pages that have been affected one of the developers has passed a control through as a parameter.
example: (all code here is on the same form)
Protected
Sub ddlSearchTeam_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ddlSearchTeam.SelectedIndexChanged Load_TOUsers(ddlTOUsers)'the above is a call to a sub. it is passing in ddlTOUsers which is a dropdownlist on the form itself
End Sub
Private Sub Load_TOUsers(ByVal ddl As DropDownList)'the above is the sub that is being called. it does some code and fills ddl with names of people. ddl is a direct copy of the control on the form. this sub runs on page load, and and a selection of another drop down list box.
End Sub
now my question is: is it the fact that it is "ByVal" in the private sub that could be causing a problem? because its basically creating a direct copy of the ddlTOUsers control at its current state.
if it was changed to "ByRef" i'm wondering if it will fix it. i'm putting this out here becuase, as i say i cant recreate the problem so dont know if its a fix or not.
cheers
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Re: Invalid postback or callback argument.
Nov 03, 2008 10:27 AM|david andrews|LINK
ok i'm pretty sure i've fixed it now.
i went to the following link and downlaoded the program 'charles'
http://www.charlesproxy.com/
this allows me to slow down my internet connection to copy a modem connection. this meant that i could then go onto my website, attempt to load up a page and then click or do something before the page had loaded fully. this caused the invalid postback error.
i could now cause this error on command which means i could debug it properly.
i then added the following code to the page_load event, outside of the check for page.ispostback.i go back to my website again and try to cause the invalid postback error and the code now catches it and outputs a nice messagebox.
Page.ClientScript.RegisterHiddenField("PageLoadedHiddenTxtBox", "") Dim scriptCommand As String = "document.getElementById('PageLoadedHiddenTxtBox').value ='Set';" Dim preSubmitCommad As String = "var loaded=document.getElementById('PageLoadedHiddenTxtBox').value; if(loaded=='Set'){return true};alert('please wait for page to completely load before submitting to site.');return false;" Page.ClientScript.RegisterStartupScript(Me.[GetType](), "onLoad", scriptCommand, True)Page.ClientScript.RegisterOnSubmitStatement(
Me.[GetType](), "OnSubmit", preSubmitCommad)None
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2 Posts
Re: Invalid postback or callback argument.
Jan 08, 2009 09:51 AM|tantanz|LINK
Thanx man.. This problem was a killer for me..
I didn't know that i had to wait for the page to complete loading b4 i can click on anything then.
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7 Posts
Re: Invalid postback or callback argument.
May 18, 2009 11:15 AM|abz52|LINK
What I am curious about is why this problem appeared only when I moved to .Net 3.5, it worked fine on 1.1?
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2 Posts
Re: Invalid postback or callback argument(Solution Fixed)
May 26, 2009 06:03 AM|vivek.kumar@proteans.com|LINK
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Re: Invalid postback or callback argument.
May 26, 2009 06:31 AM|vivek.kumar@proteans.com|LINK
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Re: Invalid postback or callback argument.
Jun 05, 2009 01:16 PM|Rahul Vats|LINK
The Invalid Postback or Callback argument can happen in multiple different scenarios in multiple different cases. However the root reason that I figured out in all cases that remains is the fact that the event that took place happened with a control that had got different ID than when the action was about to be taken. To understand my point consider this example:
I had a Grid on my Page with Delete buttons to delete a particular row in the Grid. Now everytime I click on the Delete Button, even before the action for the event of Delete button took place the GridView was rebinded which results in the change of Contorl ID for the Delete button as for the Grid that was rebinded all the ID's were different or atleast regenerated than from the one on which I clicked delete button on and hence the result was this error. I tried allmost solutions posted on this page but nothing worked. Than using Firebug I decided to study all the control details because on same page a similar grid with similar logic of delete button functionality was working fine and not the second one. And boom got the solution. Removing the grid.databind() from the place before the action for delete does the trick for me. And than I tried other example that were posted and yeah as I though on most of it the problem was the ID of the control was different at the time was page trying to take the corresponding action against the ID control at the time even took place. So knowing that most of the problem posted on this thread had the solution in the same manner I think almost all the errors that anyone has got can be fixed if they just check that whether the control is getting regenerated anywhere in the code before the corresponding action for their particular event is taken.
Hope People find it correct solution.
.NET 3.0 .net 1.1 2.0 web server App_Code Invalid postback or callback argument.
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Re: Invalid postback or callback argument.
Jun 09, 2009 09:40 AM|cyberowl|LINK
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Re: Invalid postback or callback argument.
Jun 10, 2009 02:25 AM|cyberowl|LINK
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Re: Invalid postback or callback argument.
Jul 11, 2009 02:29 AM|ravimishra9999|LINK
hello......nice solution
my page is running properly....
thanks....
ravi mishra
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Re: Invalid postback or callback argument.
Jul 20, 2009 03:06 PM|govcoder|LINK
In the process of upgrading a 1.1 app to 3.5, I ran into this problem. I added the solution using VB.Net, although the suggested solution was in C#. Not hard to convert it over...
Protected Overrides Sub Render(ByVal writer As HtmlTextWriter) Register(Me) 'the C# equivalent used "this" which is the me equivalent...odd Me.Render(writer) End Sub Private Sub Register(ByVal ctrl As Control) Dim c As Control For Each c In ctrl.Controls Register(c) If TypeOf c Is System.Web.UI.WebControls.DropDownList Then Else Page.ClientScript.RegisterForEventValidation(ctrl.UniqueID) End If Next End SubAnyway, it didn't work. I can see where I've done anything wrong, though perhaps I have and missed it. Brain fog.
The form I'm working with has several textboxes and 2 dropdownlists. What I'm wondering is whether I have to add the values for all items in both dropdownlists to get it to pass validation?
I also have wondered whether I need to use the PostBackOptions object or the ValidateEvent method before it resolves the problem? Any help is greatly appreciated! I've been trying to get over this problem for almost 2 months with little luck. Thanks!
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12 Posts
Re: Invalid postback or callback argument.
Aug 25, 2009 03:40 PM|spankster|LINK
FWIW I had the same issue and resolved it by getting rid of the asp:Button and handling the code (on submit) w an input button.
I defined the button on my aspx page as such:
Private Sub Submit1_ServerClick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Submit1.ServerClick DataCheck() If tfValidated <> "False" Then FillinStrings() 'Server.Transfer("Entry.aspx") btnSubmit.Visible = False pnlUpdate.Visible = False lblError.Visible = True lblError.Text = "Your time has been submitted. Thank you." Submit1.Visible = False End If End SubHope this is a good alternative for the ones that have tried the other alternatives w no success.
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Re: Invalid postback or callback argument.
Sep 10, 2009 10:31 AM|sainiamritpal|LINK
I was pulling my hairs because of this error from last 1 day and could not find the solution, then I tried your code it Works for me ,
On the same time I created a user on this site to thank you
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Re: Invalid postback or callback argument.
Sep 10, 2009 11:11 AM|spankster|LINK
If your directing that thanks at me, you're most welcome. Im glad I was able to help and hopefuly you have some hair left because of me :)