var downLoad = new FileInfo(Server.MapPath("~/upload/员工考勤记录.xls"));

            Response.Clear();

            Response.ClearHeaders();

            Response.Buffer = false;

            Response.ContentType = "application/octet-stream";

            var filename = string.Format("attachment;filename={0}",

                Request.Browser != null && Request.Browser.Browser.Equals("InternetExplorer")

                    ? HttpUtility.UrlEncode(downLoad.Name, Encoding.UTF8)

                    : downLoad.Name);

            Response.AppendHeader("Content-Disposition", filename);

            Response.AppendHeader("Content-Length", downLoad.Length.ToString(CultureInfo.InvariantCulture));

            Response.ContentEncoding = System.Text.Encoding.UTF8;

            Response.WriteFile(downLoad.FullName);

            Response.Flush();

            Response.End();