export to excel in asp.net

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ASP.NET

i want to download gridview data to excel but i am getting error like this [System.Threading.ThreadAbortException] = {Unable to evaluate expression because the code is optimized or a native frame is on top of the call stack.}

here is code ..please tell me anyone

string filename = "DownloadMobileNoExcel.xls";
                                System.IO.StringWriter tw = new System.IO.StringWriter();
                                System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
                                GridExcelDetails.DataSource = GetTSubscriberDetails;
                                GridExcelDetails.DataBind();
                                updatexcel.Update();
                                //Get the HTML for the control.
                                GridExcelDetails.RenderControl(hw);
                                //Write the HTML back to the browser.
                                //Response.ContentType = application/vnd.ms-excel;
                                Response.ContentType = "application/vnd.ms-excel";
                                Response.AppendHeader("Content-Disposition", "attachment; filename=" + filename + "");
                                this.EnableViewState = false;
                                Response.Write(tw.ToString());                                
                                Response.End();

public override void VerifyRenderingInServerForm(Control control)
        {

        }