using System;

​

class GraphicsDevice: IGraphicsDevice {

    public void DoWork() {

        Console.WriteLine("GraphicsDevice.DoWork()");

    }

}

​

// with its interface

interface IGraphicsDevice {

    void DoWork();

}

​

// You can't just override DoWork in a child class,

// but if you replace usage of GraphicsDevice to IGraphicsDevice,

// then you can override this method (and, actually, the whole interface).

​

class MyDevice: GraphicsDevice, IGraphicsDevice {

    public new void DoWork() {

        Console.WriteLine("MyDevice.DoWork()");

        //base.DoWork(); // call overriden method if you need.

    }

}

​

class Program {

    static void Main(string[] args) {

​

        IGraphicsDevice real = new GraphicsDevice();

        var myObj = new MyDevice();

​

        // demo that interface override works

        GraphicsDevice myCastedToBase = myObj;

        IGraphicsDevice my = myCastedToBase;

​

        // obvious

        Console.Write("Using real GraphicsDevice: ");

        real.DoWork();

​

        // override

        Console.Write("Using overriden GraphicsDevice: ");

        my.DoWork();

​

    }

}

​