Code
  Response.Clear();
            Response.AddHeader("content-disposition", "attachment;filename=OderList.xls");
            Response.AddHeader("Cache-Control", "max-age=3600");
            Response.Charset = "GB2312";
            Response.ContentEncoding = System.Text.Encoding.UTF8;
            Response.ContentType = "application/vnd.ms-excel";
            System.IO.StringWriter stringWrite = new System.IO.StringWriter();
            System.Web.UI.HtmlTextWriter htmlWrite = new HtmlTextWriter(stringWrite);
            EnableViewState = false;
            rptOrder.RenderControl(htmlWrite);//将控件的的内容输出到htmlTextWriter.
            Regex regexA = new Regex(@"\<a(?<content>[^>]*)\>");

            string str = stringWrite.ToString().Replace("display:none;", "").Replace("</a>", "");
            str = regexA.Replace(str, "");

            Response.Write(str);
            Response.End();