Scenario 10:-
First we will discuss implicit implementation of interface.

    public interface MyInterface
    {
        int foo();
    }

    public class MyClass : MyInterface
    {
        private int a = 10;

        public int foo()
        {
            return a;
        }
    }

    MyClass obj = new MyClass();
    MyInterface obj2 = (MyInterface) obj;
    obj.foo(); //Returns 10
    obj2.foo(); //Returns 10

Here foo is acting both as a class member as well as interface member.