GridView 导出Excel

protected void btndaochu_Click(object sender, EventArgs e)
        {
            GetList();//读取GridView 数据  这里就不写了
            Response.Clear();
            Response.Charset = "utf-8";
            Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
            Response.Buffer = true;
            Response.AppendHeader("Content-Disposition", "attachment;filename=中标数据集合.xls");
            Response.ContentType = "application/ms-excel";
            this.EnableViewState = false;
            System.IO.StringWriter tw = new System.IO.StringWriter();
            HtmlTextWriter hw = new HtmlTextWriter(tw);
            this.GridViewMain.RenderControl(hw);
            Response.Output.Write(tw.ToString());
            Response.Flush();
            Response.End();
        }
        public override void VerifyRenderingInServerForm(Control control)
        {
            //无须填写任何代码
        }