数据导出EXCEL,XLS格式

protected void btn_xls_Click(object sender, EventArgs e)
{
if (UserList.Rows.Count == 0)
{
Page.RegisterStartupScript("", "<script>alert('无数据！');</script>");
return;
}
else
{
Response.Buffer = true;
Response.ContentEncoding = System.Text.Encoding.UTF8;
Response.AppendHeader("content-disposition", "attachment;filename=\"" + System.Web.HttpUtility.UrlEncode(DateTime.Now.ToString("yyyy-MM-dd"), System.Text.Encoding.UTF8) + ".xls\"");
Response.ContentType = "application/ms-excel";

this.EnableViewState = false;
StringWriter tw = new StringWriter();
HtmlTextWriter hw = new HtmlTextWriter(tw);
this.UserList.RenderControl(hw);
Response.Write(tw.ToString());
Response.End();
}
}

public override void VerifyRenderingInServerForm(Control control)
{
//base.VerifyRenderingInServerForm(control);
}