导出GridView到Excel中的关键之处

导出GridView到Excel中的关键之处
用法： ToExcel(GVStaff, TextBox1.Text);

public static void ToExcel(System.Web.UI.Control ctl,string FileName)
        {
            HttpContext.Current.Response.Charset ="UTF-8";
            HttpContext.Current.Response.ContentEncoding =System.Text.Encoding.Default;
            HttpContext.Current.Response.ContentType ="application/ms-excel";
            HttpContext.Current.Response.AppendHeader("Content-Disposition","attachment;filename="+""+FileName+".xls");
            ctl.Page.EnableViewState =false;
            System.IO.StringWriter  tw = new System.IO.StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(tw);
            ctl.RenderControl(hw);
            HttpContext.Current.Response.Write(tw.ToString());
            HttpContext.Current.Response.End();
        }        
     
必须有下面这句！否则不会通过！
public override void VerifyRenderingInServerForm(Control control)
    {
        // Confirms that an HtmlForm control is rendered for
    }