Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack

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ASP.NET

Hi dear all

My task is to download an excel file the data which is retrieved frm DB..

I tried with the code ....

The same code which is running in 3 form and not in a 1 specific form alone and am getting the error as

Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.

Here is my code

pls Help me whith dis

// HttpResponse response = HttpContext.Current.Response;
          Response.Clear();
          Response.Buffer = true;
          Response.ContentType = "application/vnd.ms-excel";
          Response.AddHeader("Content-Disposition", "attachment; filename=" + filename + ".xls");
        //  Response.Charset = "utf-8";
          Response.Charset = "";
          Response.ContentType = "application/vnd.ms-excel";
          //Response.ContentEncoding = System.Text.Encoding.GetEncoding("windows-1250");
          //Response.Write("<font style='font-size:11.0pt; font-family:Calibri;'>");
          //Response.Write("<BR><BR><BR>");

          using (StringWriter StrWrtr = new StringWriter())
          {
              using (HtmlTextWriter HtmlWrtr = new HtmlTextWriter(StrWrtr))
              {

                  gvexcel.HeaderRow.BackColor = Color.Gray;

                  int ColumnCount = gvexcel.Columns.Count;

                
                  for (int i = 0; i <= ColumnCount - 1; i++)
                  {
                  
                      Response.Write(gvexcel.Columns[i].HeaderText.ToString());
                      Response.Write("<B>");
                  }
                 // Response.Write("</Font>");
                  gvexcel.RenderControl(HtmlWrtr);

                  string style = @"<style> .textmode { mso-number-format:\@; } </style>";

                  Response.Write(style);
                  Response.Output.Write(StrWrtr.ToString());
                  Response.Flush();

                 // HttpContext.Current.ApplicationInstance.CompleteRequest();
                  Response.End();