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 > 0)     {         if (ds.Tables[0].Rows.Count > 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."

Answer 1

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.... } 

Answer 2

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)...