using System;

​

public class Program

{

    public static void Main()

    {

        C1 myClass = new C1();

        C2 myClass2 = new C2();

        myClass.M1();

        myClass2.M1();

        myClass2.M2();

    }

}

​

interface I1

{

    void M1();

}

​

interface I2

{

    void M2();

}

​

public class C1 : I1

{

    public void M1()

    {

        Console.WriteLine("M1 Method");

    }

}

​

public class C2 : C1, I2

{

    public void M2()

    {

        Console.WriteLine("M2 Method");

    }

}