Web Forms

Re: Passing parameter from one one ASPX to another ASPX ?

mw:17:61 — Thu, 30 Jun 2005 15:18:24 GMT

You may want to distinguish parameters visible to all users, visible to current session or to current request. There is an approach that halps to keep everthing together.
public abstract class MyContext
{
   private const string SessionParamKey = "xxxx";
   private const string GlobalParamKey= "xxxx";
   private const string CurrentRequestParamKey= "xxxx";

   public static MyTypeOne GlobalParam
   {
      get
      {
         return System.Web.HttpContext.Current.Cache[GlobalParamKey];
      }
      set
      {
         System.Web.HttpContext.Current.Cache[GlobalParamKey] = value;
      }
   }
   public static MyTypeTwo SessionParam
   {
      get
      {
         return System.Web.HttpContext.Current.Session[SessionParamKey];
      }
      set
      {
         System.Web.HttpContext.Current.Session[SessionParamKey] = value;
      }
   }
   public static MyTypeTwo CurrentRequestParam
   {
      get
      {
         return System.Web.HttpContext.Current.Items[CurrentRequestParamKey];
      }
      set
      {
         System.Web.HttpContext.Current.Items[CurrentRequestParamKey] = value;
      }
   }
}

Re: Passing parameter from one one ASPX to another ASPX ?

fadil1977 — Thu, 30 Jun 2005 15:01:35 GMT

Hi tarjei!!!!

do you mean that you have another way to do it??? can you please include a code sample ?? if you do not mind....

Re: Passing parameter from one one ASPX to another ASPX ?

stevenbey — Thu, 30 Jun 2005 14:17:08 GMT

tarjei wrote:
I like the string property way myself, since there propably isn't anything else than the .Text property you want from the textbox.

--
Tarjei

You obviously like typing a lot more than I do

Re: Passing parameter from one one ASPX to another ASPX ?

tarjei — Thu, 30 Jun 2005 14:12:05 GMT

fadil1977 wrote:
this is lovley solution... but what about if you have more than one value and more than control type.... can you use the same if yes please provide code !!

You can of course add more public properties, or do it Steven's way by exposing the whole textbox as a public variable (less typing too..). Anything you make public is accessible. I like the string property way myself, since there propably isn't anything else than the .Text property you want from the textbox.

--
Tarjei

Re: Passing parameter from one one ASPX to another ASPX ?

stevenbey — Thu, 30 Jun 2005 13:50:46 GMT

fadil1977 wrote:
this is lovley solution... but what about if you have more than one value and more than control type.... can you use the same if yes please provide code !!

You don't have to create a Property for each Control, as long as each Control is defined as public. For example:

WebForm1:
public TextBox myTextBox;

WebForm2, inside Page_Load:
if (!IsPostBack) {
WebForm1 webForm1 = Context.Handler as WebForm1;

if (null != webForm1) {

Response.Write(webForm1.myTextBox.Text);
}
}

Re: Passing parameter from one one ASPX to another ASPX ?

fadil1977 — Thu, 30 Jun 2005 13:30:16 GMT

this is lovley solution... but what about if you have more than one value and more than control type.... can you use the same if yes please provide code !!

Re: Passing parameter from one one ASPX to another ASPX ?

timoth — Thu, 30 Jun 2005 13:25:45 GMT

The way I have done this so you don't need to use session is:

1. Make a serializable class like this:

<Serializable()> Public Class RefundVars
public myVar as string
public myVar2 as string
End Class

It has to be serializable because you may want to add it to viewstate if your page postbacks to itself so you can remember it

2. Then fill this class before you redirect to the next page and add it to CONTEXT.Items like this:

context.Items.Add("refundInfo", refundInfo)

3. Then user server.transfer to go to the next page:

Server.Transfer(strWebPageName)

4. Then in the next page you can pick up the variables:

refundInfo = CType(context.Items("refundInfo"), RefundVars)

--------------------
If this is a fundamental thing of the whole application, you can make an ancestor code behind page class and code the page_load event as follows:

If (Page.IsPostBack = False) Then
         'first time loading the page
         If Not IsNothing(context.Items("refundInfo")) Then
                     'catch passed variables and store in page level variable
                     'for page processing or passing to next page
                     refundInfo = CType(context.Items("refundInfo"), RefundVars)
                     'save variable in viewstate for postbacks of the web page
                     viewState("refundInfo") = refundInfo
         End If
Else
          'post back of the page, unload our variable from viewstate
          If Not IsNothing(viewstate("refundInfo")) Then
                     refundInfo = CType(viewstate("refundInfo"), RefundVars)
          End If
End If

And when you transfer to another page, use this ancestor function:

Public Sub passInfoToNextPage(ByVal strWebPageName As String)

If Not IsNothing(refundInfo) Then
         'add to context item
         If Not IsNothing(context.Items("refundInfo")) Then
                  context.Items.Remove("refundInfo")
         End If
         context.Items.Add("refundInfo", refundInfo)
End If
Server.Transfer(strWebPageName)

Re: Passing parameter from one one ASPX to another ASPX ?

Garbin — Thu, 30 Jun 2005 13:10:36 GMT

Hi,

if you want to pass "simple" values, you can put them in the query string for the URL of the destination page.
For example, if you want to pass the parameters "action" and "id" from Page1.aspx to Page2.aspx, you can do (from Page1):

Response.Redirect("Page2.aspx?action=view&id=1234");

The querystring starts with a question mark '?' and contains name-value pairs, each one separated by '&'

In Page2.aspx, you can access the querystring from the property Request.QueryString. You will obtain a NameValueCollection
that can be accessed also by index. For example:

string action = Request.QueryString["action"];
string id = Request.QueryString["id"];

If you want to pass anything to your destination page (i.e. objects), you can expose them through public properties in Page1.aspx.
Then, in Page2.aspx, you can retrieve the object representing your Page1 WebForm.
Let's suppose you want to access an ArrayList. In Page1.aspx codebehind, you'll have a public property:

public ArrayList Arr
{
get { return myArr;}
set { myArr = value;}
}

On Page1.aspx, you will request Page2.aspx with the statement:

Server.Transfer("Page2.aspx");

On Page2.aspx you can get the form that requested the page (e.g. Page1):

Page1 handler = (Page1)Context.Handler;

Then, you can access the public properties of the Page1 WebForm:

ArrayList arr = handler.Arr;

Re: Passing parameter from one one ASPX to another ASPX ?

tarjei — Thu, 30 Jun 2005 13:07:13 GMT

Hello,

You can achieve this by using Server.Transfer().

Make public properties on the page you want to transfer from, and use Server.Transfer in a button event handler to display the second page. On the second page, you can get to the public properties on the first one using Page.Context.Handler.

An example.
WebForm1:
protected TextBox myTextBox;
public string MyTextBoxValue {
get { return myTextBox.Text; }
}

WebForm2, inside Page_Load:
if (!IsPostBack) {
WebForm1 webForm1 = Context.Handler as WebForm1;

if (null != webForm1) {

Response.Write(webForm1.MyTextBoxValue);
}
}

--
Tarjei

Re: Passing parameter from one one ASPX to another ASPX ?

dcyoung — Thu, 30 Jun 2005 12:34:57 GMT

Pass the parameter in the url

eg page.aspx?parameterstring1&paramterstring2

on the receiving page (c#)
strParam1 = Request.QueryString[0];
strParam2 = Request.QueryString[1];

Passing parameter from one one ASPX to another ASPX ?

bips_kr — Thu, 30 Jun 2005 10:12:03 GMT

Hi All I am using C# for an web application and I wants to pass on some of the information/data from one ASPX page to another I am avoiding to use the session object, Please advise some solution to it Thanks