update panel causing problem with file download code

Question

5.00/5 (1 vote)

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Hi,

I have to download a pdf file on a link button (which is inside update panel) clickable from a content page.

I am using following code :

C#

Response.ContentType = "Application/pdf";
Response.AppendHeader("Content-Disposition","attachment;filename=Softgen.pdf");
Response.TransmitFile(Server.MapPath("Hosts_Win_Brochure.pdf"));
Response.End();

but it is giving error:

Microsoft JScript runtime error: 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-1.5
%��
4 0 ob'.

Posted 2-Nov-10 21:26pm

Rohit from Delhi

Updated 2-Nov-10 22:52pm

Dalek Dave

v3

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Sunasara Imdadhusen · Accepted Answer · 2010-11-02T21:33:00

Hi Naveen,

You have to define ControlID={You linkbutton ID} in <triggers>

XML

<asp:UpdatePanel runat="server" ID="upFiles" UpdateMode="Conditional">
                               <ContentTemplate>
                               </ContentTemplate>
                               <Triggers>
                                   <asp:PostBackTrigger ControlID="gvNewFiles" />
                               </Triggers>
                           </asp:UpdatePanel>

Please use following code to Download file:

VB

Public Shared Function DownloadFile(ByVal filePath As String) As Boolean
        Try
            If File.Exists(HttpContext.Current.Server.MapPath(filePath)) Then
                Dim strFileName As String = ""
                strFileName = System.IO.Path.GetFileName(HttpContext.Current.Server.MapPath(filePath))
                strFileName = strFileName.Replace(" ", "%20")
                HttpContext.Current.Response.ContentType = "application/octet-stream"
                HttpContext.Current.Response.AddHeader("Content-Disposition", "attachment; filename=" & strFileName) ' System.IO.Path.GetFileName(HttpContext.Current.Server.MapPath(filePath)))
                HttpContext.Current.Response.Clear()
                HttpContext.Current.Response.WriteFile(HttpContext.Current.Server.MapPath(filePath))
                HttpContext.Current.Response.End()
            Else
                Return False
            End If
        Catch ex As Exception
            Return False
        End Try
    End Function

Please do let me know, if you have any doubt.

Please provide "Vote":thumbsup: if this would be helpful, and make "Accept Answer" if this would be correct answer.:rose:

Thanks,
Imdadhusen