Can I Achieve Dynamic Polymorphism Using New Keyword?

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C#3.5

Hello Friends,

I tried something below:

class Program
    {
        static void Main(string[] args)
        {
            Program2 p2 = new Program2();
            p2.show();

            p2 = new Program3();
            p2.show();

            Console.Read();
        }

    }

   public class Program2
    {

       public virtual void show()
       {

           Console.WriteLine("Program2");

       }

    }


   public class Program3 :Program2
   {

       public new  void show()
       {
           Console.WriteLine("Program3");
       }

   }

In the above code snippet, i have used the new keyword in the Program3 class before the show() method.

Now, when i assign the object of Program2 to Program3 and call the show(), the output is always

"Program2".

I have differentiated the 2 methods, in the derived class i have used the new keyword. So my doubt is:

1>What is the significance of the new keword.
2>Why is the method of the base class called always, even though i assign the object of the base to the derived.

Thanks a ton,
Rahul