using System;

public class Program

{

    public static void Main()

    {

        var c = new C();

        ((IFoo)c).Call();

        ((IBar)c).Call();

    }

    public class C : IFoo, IBar

    {

    }

    public interface IFoo

    {

        void Call() => Console.WriteLine("Foo");

    }

    public interface IBar

    {

        void Call() => Console.WriteLine("Bar");

    }

}