public async Task <IActionResult> OnGetÜberzeitkontrolleAsync() { UserModel user = _db.User.Where(u => u.ID == new Guid(User.FindFirst(ClaimTypes.NameIdentifier).Value)).FirstOrDefault(); var filename = @"Überzeitkontrolle_" + user.Department + ".xlsx"; await ExcelHandler.CreateÜberzeitkontrolle(user.Department, _db); return(File(System.IO.File.ReadAllBytes(@"C:\temp\" + filename), "application/vnd.ms-excel", filename)); }