Virtual, Override and New Keyword

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C#

Hi Friends.,

I am confused with the below program:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Learn
{
    class Program
    {
        static void Main(string[] args)
        {
            // Reference B through A.
            A ab = new B();
            ab.Y();

            // Reference C through A.
            A ac = new C();
            ac.Y();

            Console.Read();
        }
    }

    class A
    {
        public virtual void Y()
        {
            // Used when C is referenced through A.
            Console.WriteLine("A.Y");
        }
    }

    class B : A
    {
        public override void Y()
        {
            // Used when B is referenced through A.
            Console.WriteLine("B.Y");
        }
    }

    class C : A
    {
        new public void Y()
        //public void Y() // Can be "new public void Y()"
        {
            // Not used when C is referenced through A.
            Console.WriteLine("C.Y");
        }
    }
}

B.Y
A.Y

I got this example from dotnetperls

As per their tips I understood that we can Hide the function of base class in derived class using New Modifier keyword.

In the above sample program I have a class C which inherits class A. Here I am using new keyword to hide the base class function. But still it is displaying the output as A.Y instead of C.Y.

It would be great if any one can explain me about this.