gridview导出 excel bt事件没反应！求解！

Question

bt事件如下，但是点击没反应？奇了个怪了？
哪里出错了？ protected void Button1_Click(object sender, EventArgs e)
        {
            Export("application/ms-excel", "考勤.xls");
        }
        private void Export(string FileType, string FileName)
        {
            HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            HttpContext.Current.Response.ContentType = "application/ms-excel";
            HttpContext.Current.Response.AppendHeader("Content-Disposition", "attachment;filename=" + FileName + ".xls");
            GridView1.Page.EnableViewState = false;
            System.IO.StringWriter tw = new System.IO.StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(tw);
            GridView1.RenderControl(hw);
            HttpContext.Current.Response.Write(tw.ToString());
            HttpContext.Current.Response.End();        }
        public override void VerifyRenderingInServerForm(Control control)
        {
        }

Answer 1

原来我是放在 updatepanel里了，去掉它就ok了