$filename= ROOT . "/load/catalog.pdf";
$file_name="catalog.pdf";
header("Cache-control: private");
header("Content-type: application/force-download");
header("Content-Length: ".filesize($filename));
header("Content-Disposition: filename=".$file_name);
readfile($filename);
public FileResult Download(string fileName)
{
return File(“<your path>” + fileName, System.Net.Mime.MediaTypeNames.Application.Octet);
}