C#文件下载

  FileInfo DownloadFile = new FileInfo(FullFileName); //文件绝对路径
                if (DownloadFile.Exists)
                {
                    response.Clear();
                    response.ClearHeaders();
                    response.Buffer = false;
                    response.ContentType = "application/octet-stream";
                    response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(DownloadFile.FullName, System.Text.Encoding.ASCII));
                    response.AppendHeader("Content-Length", DownloadFile.Length.ToString());
                    response.WriteFile(DownloadFile.FullName);
                    response.Flush();
                  //  response.End();
                 }