Interface Implementation in C#

using System;

namespace ConsoleApplication16
{
    public interface A
    {
        void Hello();
    }
    public interface B
    {
        void Hellonew();
    }

    // Interface C inherite interface A and B
    //  C is a interface so can not define the function of interface A and B function inherted
    // Program  class we do implementation

    public interface C : A , B
    {
        void HelloOld();
    }

   public class Program : C
    {
       void A.Hello()   // this is the way to implement a function to reduce ambiguity bacuse may be other interface may have same function name
        {
          Console.WriteLine("Interface A is Called");
        }
        void B.Hellonew() // same as Interface A
        {
            Console.WriteLine("Interface B is Called");
        }
        void C.HelloOld()  // same as Interface A
        {
            Console.WriteLine("Interface C is Called");
        }

    }
   class derived : Program
   {
       static void Main(string[] args)
       {
           derived obj = new derived();  // this is the way to call interface  function by derived class from Program class

           ((C)obj).Hello();
           ((C)obj).Hellonew();
           ((C)obj).HelloOld();

           C objnew = new Program(); // this is the way to call interface  function by Program class

           objnew.Hello();
           objnew.Hellonew() ;
           objnew.HelloOld();

           Console.ReadKey();
       }


   }
}