using System;

​

​

namespace ConsoleApplication16

{

    public interface A

    {

        void myMethod1();

        void myMethod2();

    }

    public interface B : A

    {

        void myMethod3();

    }

    public class Program1 : B

    {

       public void myMethod1()

        {

            Console.WriteLine("Implement method1");

        }

        public void myMethod2()

        {

            Console.WriteLine("Implement method2");

        }

       public void myMethod3()

        {

            Console.WriteLine("Implement method3");

        }

    }

  public  class Program

    {

       public static void Main(string[] args)

        {

            Program1 obj = new Program1();

            obj.myMethod1();

            obj.myMethod2();

            obj.myMethod3();

        }

    }

}

​