public Airport VName(Airport airport, IAirportService _airportService) { if (String.IsNullOrEmpty(airport.Name) || airport.Name.Trim() == "") { airport.Errors.Add("Name", "Tidak boleh kosong"); } else if (_airportService.IsNameDuplicated(airport)) { airport.Errors.Add("Name", "Tidak boleh diduplikasi"); } return(airport); }