public void InflateAllVehicleWheelsToMax(string i_LicenseNumber) { Vehicle desiredVehicle = getVehicleByLicenseNumber(i_LicenseNumber); if (desiredVehicle.Equals(null)) { throw new KeyNotFoundException(k_VehicleNotFoundMessage); } desiredVehicle.InflateAllWheelsToMaxAirPressure(); }