C#

[Serializable]<br />
public class MyObject <br />
{<br />
  public int n1;<br />
  [NonSerialized] public int n2;<br />
  public String str;<br />
}

<code>interface IVehicle
{
    void Start();
}

class Car : IVehicle
{
    public Car() { }
    public void Start() { Console.WriteLine("starting Car..."); }
}

class Truck : IVehicle
{
    public Truck() { }
    public void Start() { Console.WriteLine("starting Truck..."); }
}

--test class--
void StartVehicle(IVehicle vehicle)
{
    vehicle.Start();
}

void Main()
{
    Car myCar = new Car();
    IVehicle vehicle = (IVehicle)myCar;

    Truck myTruck = new Truck();
    IVehicle vehicle2 = (IVehicle)myTruck;

    StartVehicle(vehicle);
    StartVehicle(vehicle2);

}</code>