public abstract class A 
{ 
    public virtual string Print() { return "A"; } 
} 
 
public class B : A 
{ 
    public override string Print() { return "B"; } 
} 
 
public class C : B 
{ 
    public new string Print() { return "C"; } 
} 
A ac = new C(); 
Console.WriteLine(ac.Print());