Scenario:-
Interface polymorphism with multiple interfaces having same method.

    public interface MyInterface1
    {
        int foo();
    }

    public interface MyInterface2
    {
        int foo();
    }
    public class MyClass : MyInterface1, MyInterface2
    {
        int a = 10;

        #region MyInterface1 Members

        public int foo()
        {
            return a;
        }

        #endregion
    }

           MyClass obj = new MyClass();
            MyInterface1 obj2 = (MyInterface1)obj;
            MyInterface2 obj3 = (MyInterface2)obj;
            obj.foo(); //Returns 10 
            obj2.foo(); //Returns 10
            obj3.foo(); //Returns 10