下载GridView到Excel

        /// <summary>  
        /// 导出方法  
        /// </summary>  
        /// <param name="GridView">被导出的GridView</param>  
        /// <param name="filename">保存的文件名称</param>  
        private void ExportGridViewForUTF8(GridView GridView, string filename)
        {

            string attachment = "attachment; filename=" + filename;

            Response.ClearContent();
            Response.Buffer = true;
            Response.AddHeader("content-disposition", attachment);

            Response.Charset = "UTF-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("UTF-8");
            Response.ContentType = "application/ms-excel";
            System.IO.StringWriter sw = new System.IO.StringWriter();
            HtmlTextWriter htw = new HtmlTextWriter(sw);
            GridView.RenderControl(htw);
            Response.Output.Write(sw.ToString());
            Response.Flush();
            Response.End();
        }

        /// <summary>  
        /// 重载，否则出现“类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标... ”的错误  
        /// </summary>  
        /// <param name="control"></param>  
        public override void VerifyRenderingInServerForm(Control control)
        {

        }