using System;

public class Program

{

    public static void Main()

    {

        var item = new Simple();

        var item2 = new Simple2();

        //Dupa

        item.DoWork();

        //udalo sie

        item2.DoWork()

    }

}

​

​

public interface ISimple

{

    void DoWork()

    {

        Console.Write("Dupa");

    };

}

​

public class Simple : ISimple

{

}

​

public class Simple2 : ISimple

{

    public void DoWork()

    {

        Console.Write("Udalo sie");

    }

}

​