public static void Ride(this WildHorse horse)
{
horse.Catch();
horse.Mount();
// No need to start, the wild horse is already
// running for it's life when someoune mounts.
}
public void TestRide()
{
Debug.WriteLine("Riding horse...");
Horse horse = new Horse();
horse.Ride();
Debug.WriteLine("Riding wild horse...");
WildHorse wildHorse = new WildHorse();
wildHorse.Ride();
Debug.WriteLine("Treating wild horse as horse...");
horse = wildHorse;
horse.Ride();
}