Scenario :-
Lets now discuss explicit implementation of interface be taking below example. In explicit implementation functions are qualifies with parent interface names as below:-

    public interface MyInterface
    {
        int foo();
    }

    public class MyClass : MyInterface
    {
        int a = 10;

        #region myinterfacse Members

        int MyInterface.foo()
        {
            throw new NotImplementedException();
        }

        #endregion
    }

Now there will be some errors in code of scenario 10 as below

   MyClass obj = new MyClass();
            MyInterface obj2 = (MyInterface)obj;
            obj.foo(); //Compile time error.No class member foo
            obj2.foo(); //Returns 10