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

See more:

ASP.NET

Hi
I have a button that Exports to Excel. It works fine and all until it get's to the Response.End();
After that I get an error saying {Text = Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.} After that the a window pops up that asks if you want to save or view the file. It shows that it's a Excel file, but as soon as I view it, it opens in Visual Studio 2009. Any help on how to solve this problem would be appreciated, here is the code I am currently using:

public override void VerifyRenderingInServerForm(Control control)
    {
        //Verifies that the control is rendered
    }

    protected void btnExportToExcel_Click(object sender, EventArgs e)
    {
        try
        {
            if (gvCustomData.Rows.Count > 0)
            {
                Response.Clear();
                Response.Buffer = true;
                Response.ContentType = "application/vnd.ms-excel";
                // Response.ContentType ="application/text";
                Response.AddHeader("Content-Disposition", "attachment;CustomData.xls");

                Response.Charset = "";
                this.EnableViewState = false;

                System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
                System.Web.UI.Html32TextWriter oHtmlTextWriter = new System.Web.UI.Html32TextWriter(oStringWriter);
                gvCustomData.RenderControl(oHtmlTextWriter);

                Response.Write(oStringWriter.ToString());
                Response.End();
            }
        }

        catch (Exception ex)
        {
            Adhoc.msg(this, "Error: " + ex.Message);
        }
    }