protected void Button1_Click(object sender, EventArgs e)
        {
        string FileName = "得分表 " + DateTime.Now + ".xls";
        Response.Charset = "GB2312";
        Response.ContentEncoding = System.Text.Encoding.UTF8;//System.Text
        //如果设置GB2312会出现乱码
        Response.AddHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8).ToString());
        Response.AddHeader("content-type", "application / ms - excel");//设置输出文件的类型
        //或Response.ContentType = FileType;
        //定义一个输出流
        StringWriter tw = new StringWriter();//System.IO
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        GridView1.RenderControl(hw);//gridview绑定
        Response.Write(tw.ToString());
        Response.End();
    }

    public override void VerifyRenderingInServerForm(Control control)
    {
//必须写这个；
    }
        }