public IActionResult Add(Flight NewFlight) { if (User.IsInRole("Admin") == false) { return(RedirectToAction("Index", "Home")); } if (NewFlight == null) { throw new ArgumentNullException(nameof(NewFlight)); } var newFlight = new Flight { Origin = NewFlight.Origin, Destination = NewFlight.Destination, Departure = NewFlight.Departure, Status = 0, PlaneId = NewFlight.PlaneId }; _flights.Add(newFlight); return(RedirectToAction("Index", "Flight")); }