public ActionResult AdminDownload(int id)
{
var caseStudy = _casestudyRepository.GetNullableById(id);
if (caseStudy == null) return File(new byte[0], string.Empty);
var fileName = caseStudy.Name.Replace(" ", string.Empty);
return File(caseStudy.File, "application/pdf", string.Format("{0}.pdf", fileName));
}