asp.net下载代码

private void FileDownload(string FullFileName)
  {
   FileInfo DownloadFile = new FileInfo(FullFileName);
   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.UTF8));
            Response.AppendHeader("Content-Length",DownloadFile.Length.ToString());
   Response.WriteFile(DownloadFile.FullName);
   Response.Flush();
   Response.End();
  }