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 public static void DownLoadFile(string fileName, HttpResponse Response, HttpServerUtility Server)
     {
         string path = Server.MapPath("~/UpFiles/" + fileName);
         FileInfo fileInfo = new FileInfo(path);

         //TextWriter writer = new StreamWriter(defultPath);
         //HttpResponse Response = new HttpResponse(writer);

         Response.Clear();

         Response.ClearContent();

         Response.ClearHeaders();

         Response.AppendHeader("Content-Disposition", "attachment;   filename=\"" + Server.UrlEncode(fileName) + "\"");

         Response.AddHeader("Content-Length", fileInfo.Length.ToString());

         Response.AddHeader("Content-Transfer-Encoding", "binary");

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

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

         Response.WriteFile(fileInfo.FullName);

         Response.Flush();

         Response.End();
     }

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防中文乱码：Server.UrlEncode(fileName)