01.System.Web.HttpResponse response = System.Web.HttpContext.Current.Response;
02.response.ClearContent();
03.response.Clear();
04.response.ContentType = "text/plain";
05.response.AddHeader("Content-Disposition",
06. "attachment; filename=" + fileName + ";");
07.response.TransmitFile(Server.MapPath("text.txt"));
08.response.Flush();
09.response.End();
