I am trying to render a PDF from a reportviewer on a button click.  I have found the following code, but it only works when is placed in the Page_Load event.  I can't seem to make it work for the Button_Click event.  I receive an error.  I'm doing this as a "Work Around" for the lack of a print button on the ReportViewer Control when in local mode.  Is there a better way than this?  Thanks.

Code for Button_Click Event: 

        Dim AuditInv As New DVDWarehouse
        ReportViewer1.ProcessingMode = ProcessingMode.Local
        Dim rep As LocalReport = ReportViewer1.LocalReport
        rep.ReportPath = "InventoryAudit.rdlc"

        Dim dt As DataTable = AuditInv.GetDataTable("Select Inventory.BoxID, Inventory.SKU, DVDInfo.Title, Inventory.ItemCount from Inventory, DVDInfo where DVDInfo.SKU = Inventory.SKU ORDER by BoxID", "Inventory")

        Dim dsAudit As New ReportDataSource
        dsAudit.Name = "InventoryAudit_InventoryAudit"
        dsAudit.Value = dt
        rep.DataSources.Clear()
        rep.DataSources.Add(dsAudit)

        Dim warnings As Microsoft.Reporting.WebForms.Warning() = Nothing
        Dim streamids As String() = Nothing
        Dim mimeType As String = Nothing
        Dim encoding As String = Nothing
        Dim extension As String = Nothing
        Dim DeviceInfo As String = "<DeviceInfo>" _
            & "  <OutputFormat>PDF</OutputFormat>" _
            & "  <PageWidth>8.5in</PageWidth>" _
            & "  <PageHeight>11.5in</PageHeight>" _
            & "  <MarginTop>0.6in</MarginTop>" _
            & "  <MarginLeft>0.6in</MarginLeft>" _
            & "  <MarginRight>0.4in</MarginRight>" _
            & "  <MarginBottom>0.4in</MarginBottom>" _
            & "</DeviceInfo>"
        Dim bytes As Byte()
        bytes = ReportViewer1.LocalReport.Render("PDF", DeviceInfo, mimeType, encoding, extension, streamids, warnings)
        Response.Clear()
        Response.ContentType = mimeType
        Response.AddHeader("content-disposition", "attachment; filename=Test." & extension)
        Response.BinaryWrite(bytes)
        Response.End()

Error Message when i click the button:

Sys.WebForms.PageRequestManagerParserErrorException:  The message received from the server could not be parsed.  Common causes for this error are when the response is modified by calls to Response.Write(), response filters, HttpModules or server trace is enabled.
Details:  Error parsing near '%PDF-1.3%
1 0 obj'.

Thanks 

Hi:

bortiquai:

but it only works when is placed in the Page_Load event.  I can't seem to make it work for the Button_Click event. 

  If so my suggestion is to use <input type="submit'> directly and add JavaScript function to it's "onclick" event. In the JavaScript function you can change a hidden input's value. Then in Page_Load you can know whether the button is clicked via the value of the hidden input.

  Another option is simply add Response.Redirect("url_of_new_page") in the click event handler to redirect to a new page. In the new page's Page_Load event handler you can write the code to render pdf file.

  And check out this article to see whether it can help:

http://technoblab.blogspot.com/

Regards

The Problem is, since your using AJAX Update panel. Because  AJAX Update panel render page proportionally you can write anything to the Response Object, which means after the page is completely load. That's why you can run this code in the Page_Load event.

This is the cause for the error.

bortiquai:

Response.Clear()
        Response.ContentType = mimeType
        Response.AddHeader("content-disposition", "attachment; filename=Test." & extension)
        Response.BinaryWrite(bytes)
        Response.End()

But don't worry there's a remedy for this.

 What i recommending is display report in a new pop-page.

Follow these steps.

1. Add a new aspx page,says reports.aspx, to the project. In that code behind file, add this coding,  (C# coding)
   

   protected Page_Load(object sender, EvntArgs e)
   {
   Response.ContentType = "application/pdf";// set the MIME type here
   Response.AddHeader("content-disposition", "attachment; filename=Test."  + extension)
   Response.BinaryWrite((byte[])Session["rpt"]);
   }
   

    
2. In your Button_Click event ,remove this  

   Response.Clear()
           Response.ContentType = mimeType
           Response.AddHeader("content-disposition", "attachment; filename=Test." & extension)
           Response.BinaryWrite(bytes)
           Response.End()

    and add this (C# coding) 

   Session["report"] = bytes;
    System.Text.StringBuilder _sb = new System.Text.StringBuilder();
    _sb.Append("window.open('reports.aspx','',");
    _sb.Append("'toolbar=0,menubar=0,resizable=yes')");
    ScriptManager.RegisterStartupScript(Page, Page.GetType(), "winOpen", _sb.ToString(), true);

    

if you want to report display in the same page, 

 _sb.Append("window.open('reports.aspx','_self',"); 
instead of 
 _sb.Append("window.open('reports.aspx','',");

Now it should work.  Please note that my codings are in C# syntax.

 Problem

html:

LoadFilteredMembers();

Response.ContentType = "text/csv";

Response.Charset = "";

string[] dataArr = new String[dt.Columns.Count];

return "";

return o.ToString();

else

Solution:

<Triggers>

<asp:PostBackTrigger ControlID="btnCSV"/>

www.JeremyThompson.Net (MCSD.Net, MCT 06/07)

I used the above mentioned code but still my problem dint get solved,

now using

<Triggers>

<asp:PostBackTrigger ControlID="btnCSV"/>

is not giving parseerror exception but a new window is opening

please help me in this

opening this in new page is not giving any error but only in update panel i am getting the new window in button click

below is the code i am using

'**clear repsponce

'**raises down load window of operating system and allows to select application type.

'**no need to set content type so that you can save in any format

Response.ContentType = "application/txt"

'** remove the charset from the content-type header.

Response.Charset = ""

Dim _ColFeeSchdInfo As New List(Of EZCAPNETEntity.FeeSchedule_Class)

ds = _BAL.getFeescheduleNew_OutLoad(_FeeSchd, "O")

Dim dr As DataRow

Dim arr() As Object

Next

Next

End Function

thanks

Usha