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  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();
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