static void doWork() { Console.WriteLine("Journey by airplane:"); Airplane myPlane = new Airplane(); myPlane.StartEngine("Contact"); myPlane.TakeOff(); myPlane.Drive(); myPlane.Landing(); myPlane.StopEngine("Whirr"); Console.WriteLine(); Console.WriteLine("Journey by car:"); Car myCar = new Car(); myCar.StartEngine("Brumm Brmm"); myCar.Accelerate(); myCar.Drive(); myCar.Brake(); myCar.StopEngine("Phut Phut"); Console.WriteLine("\nTesting polymorphism"); Vehicle v = myCar; v.Drive(); v = myPlane; v.Drive(); }