using System;
class PruebaOcultamiento
{
    public class ClaseBase
    {
        public int x;
 
        public void Invocar ()
        {
            Console.WriteLine ("ClaseBase.Invocar");
        }
    }
 
    public class ClaseDerivada : ClaseBase
    {
        new public void Invocar ()
        {
            Console.WriteLine ("ClaseDerivada.Invocar");
        }
    }
 
    public static void Main ()
    {
        ClaseDerivada cd = new ClaseDerivada ();
 
        ClaseBase cb = cd;
 
        cb.Invocar();
    }
}

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