public class Program

{    

    class X {

        public void foo(double d) { System.Console.Write("d"); }

        public void foo(int i) { System.Console.Write("i"); }

        public void inside() {

            foo(1);

            foo(1.0);

        }

    }

​

    class Y {

        public void foo(double d) { System.Console.Write("d"); }

        private void foo(int i) { System.Console.Write("i"); }

        public void inside() {

            foo(1);

            foo(1.0);

        }        

    }

​

    public static void Main()

    {

        var x = new X();

        x.foo(1);

        x.foo(1.0);

        x.inside();

        System.Console.WriteLine();

        System.Console.WriteLine();

        var y = new Y();

        y.foo(1);

        y.foo(1.0);

        y.inside();

    }

}

​