asked on

Response.WriteFile gives error message

When I do a Response.WriteFile, I'm getting this error message:

Error: Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed.

If I do the Response.WriteFile from a blank WEB page, it works OK.

Do I need to do some sort of cleanup in the HTTP response object?

Big Monty

have a read through this article, including the comments, it seems there are various possibilities for this error message

OriNetworks

Before you do the .WriteFile you could Try
Response.Clear

SOLUTION

Johny Bravo

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

HLRosenberger

ASKER

The_Big_Daddy - What article?

OriNetworks - I did try Clear. Not help

johny_bravo1 - How do I add postbacktrigger?

HLRosenberger

ASKER

Here the codebehind:

Response.Clear()
Response.ClearHeaders()
Response.ClearContent()
Response.AddHeader("content-disposition", "attachment; filename=" + filename)
Response.AddHeader("Content-Type", "application/Excel")
Response.ContentType = "application/vnd.xls"
Response.AddHeader("Content-Length", File.Length.ToString())
Response.WriteFile(File.FullName)

HLRosenberger

ASKER

Here's the aspx.
ShowTds-client-wishlistTable.aspx

ASKER CERTIFIED SOLUTION

Big Monty

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

HLRosenberger

ASKER

I also have this in page init:

Public Sub aaa() Handles Me.Init

Dim scriptManager As New ScriptManager
scriptManager.GetCurrent(Me.Page)
scriptManager.RegisterPostBackControl(Me.btnExcelExport)
scriptManager.EnablePartialRendering = False

End Sub

HLRosenberger

ASKER

The_Big_Daddy - I got it working. I goofed in accessing the scriptManager on the page. See previous post. I already had a scriptManager in a mater page. So in page init I had to find the scriptManager control and the do this:

Dim sm As ScriptManager
sm.RegisterPostBackControl(Me.btnExcelExport)

Now, why does this work? What does RegisterPostBackControl do that cause the error message to go away?

HLRosenberger

ASKER

johny_bravo1 - Why does adding a postbacktrigger for the button fix this problem?

HLRosenberger

ASKER

I've requested that this question be closed as follows:

Accepted answer: 0 points for HLRosenberger's comment #a39556744
Assisted answer: 250 points for johny_bravo1's comment #a39556216
Assisted answer: 250 points for The_Big_Daddy's comment #a39556535

for the following reason:

thanks.

HLRosenberger

ASKER

Thanks