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string userAgent = Request.UserAgent;
string _displayName = HttpUtility.UrlEncode(displayName);
_displayName = _displayName.Replace("+", "%20");
Response.AppendHeader("Content-Disposition", "attachment;filename=" + _displayName);
Response.ContentType = "application/octet-stream";
Response.WriteFile(destFile);
Response.Flush();
Response.End();