asp.net 导出数据到Excle

        System.IO.StringWriter tw = new System.IO.StringWriter();
        System.Web.UI.HtmlTextWriter hw = new System.Web.UI.HtmlTextWriter(tw);
        hw.WriteLine(sb.ToString());
        HttpContext.Current.Response.Write(tw.ToString());

        HttpContext.Current.Response.End();

        hw.Flush();
        hw.Close();
        tw.Flush();
        tw.Close();
    }