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

Question

I have a grid view on my page and I want to export it to the Excel Sheet  Below is the code I had written to do this task  here I am already passing the dataset to the method to bind the grid and btnExcelExport is the button which will export the Grid Content in to Excel Sheet  -  private void BindGridView DataSet ds        if  ds Tables Count  gt  0                if  ds Tables 0  Rows Count  gt  0                        GVUserReport DataSource   ds              GVUserReport DataBind                btnExcelExport Visible   true                     protected void btnExcelExport Click object sender  EventArgs e        Response Clear        Response AddHeader  content-disposition   attachment filename FileName xls        Response Charset           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       GVUserReport RenderControl htmlWrite       Response Write stringWrite ToString         Response End       public override void VerifyRenderingInServerForm Control control        return      Now when I am debugging I found that the grid is binded sucessfully but when trying to export it to Excel  I m getting this error       Microsoft JScript runtime error    Sys WebForms PageRequestManagerParserErrorException  The message   received from the server could not be parsed

User · Answer

I added the control to the Triggers tag in the update panel        lt  ContentTemplate gt       lt Triggers gt           lt asp PostBackTrigger ControlID  exportLinkButton    gt       lt  Triggers gt   lt  asp UpdatePanel gt    This way the exportLinkButton will trigger the UpdatePanel to update  More info here

User · Answer

This worked for me too  but with an addition  below    protected void Page Load object sender  EventArgs e      ScriptManager scriptManager   ScriptManager GetCurrent this Page     scriptManager RegisterPostBackControl this btnExcelExport       Further code goes here         I was registering a script on my button to click on another button after its event was finished processing  In order for it to work  I had to remove the other button from the Update Panel  just in case somebody faces the same problem

User · Answer

Add this to you PageLoad and it will solve your problem   ScriptManager scriptManager   ScriptManager GetCurrent this Page   scriptManager RegisterPostBackControl this lblbtndoc1

User · Answer

What worked for me was setting aspnet MaxHttpCollectionKeys to a high value on appSettings tag on the inetpub VirtualDirectories 443 web config file    lt configuration gt       lt appSettings gt           lt add key  aspnet MaxHttpCollectionKeys  value  100000    gt       lt  appSettings gt   lt  configuration gt

User · Answer

In my case  the problem was caused by some Response Write commands at Master Page of the website  code behind   They were there only for debugging purposes  that s not the best way  I know

User · Answer

I fixed this issue  As I m using UpdatePanel  I added below code in the Page Load event of the page and it worked for me   protected void Page Load object sender  EventArgs e      ScriptManager scriptManager   ScriptManager GetCurrent this Page     scriptManager RegisterPostBackControl this btnExcelExport       Further code goes here

User · Answer

I had the same error  then I tried  lt asp PostBackTrigger ControlID  xyz   gt  instead of AsyncPostBackTrigger  This worked for me  It is because we don t want a partial postback

User · Answer

1- Never use Response Write   2- I put the code below after create  not in Page Load  a LinkButton  dynamically  and solved my problem   ScriptManager scriptManager   ScriptManager GetCurrent this Page   scriptManager RegisterPostBackControl lblbtndoc1

User · Answer

For my VB Net Friends -  Dim scriptManager As ScriptManager   scriptManager GetCurrent Me Page  scriptManager RegisterPostBackControl Me YourButtonNameHere

[c#] Sys.WebForms.PageRequestManagerParserErrorException: The message received from the server could not be parsed

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