using System;

public class Program

{

    public static void Main()

    {            

        MyClass cls = new MyClass();

        cls.DoSomething();

    }

    interface IMyInterface

    {

        void DoSomething();

    }

​

    class MyClass : IMyInterface

    {

        public void DoSomething()

        {

            Console.WriteLine("Do Something.");

        }

    }

​

}