public ActionResult Export(int?TypeFilter, Guid?CowId) { var fileDownloadName = "Događaji-" + DateTime.Now.ToShortDateString() + ".xlsx"; const string contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"; var reportUtils = new ReportUtils(); var fileStream = reportUtils.GenerateReport(TypeFilter, CowId); if (fileStream != null) { var fsr = new FileStreamResult(fileStream, contentType) { FileDownloadName = fileDownloadName }; return(fsr); } else { return(RedirectToAction("Index", "Events", new { errors = true })); } }