private void Export(string FileName)
    {
        Response.Clear();
        Response.Buffer = true;
        Response.Charset = "GB2312";
        Response.ContentEncoding = System.Text.Encoding.UTF7;
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(FileName, Encoding.UTF8).ToString() + ".xls");
        Response.ContentType = "application/ms-excel";
        this.EnableViewState = false;
        StringWriter tw = new StringWriter();
        HtmlTextWriter hw = new HtmlTextWriter(tw);
        GridView1.RenderControl(hw);
        Response.Write(tw.ToString());
        Response.End();
    }
    public override void VerifyRenderingInServerForm(Control control)
    {
    }
    protected void printout_Click(object sender, EventArgs e)
    {
        Export("学生报名信息");
    }
}