public class A {
 public virtual void Write() { Console.Write(“A”); }
}
public class B: A {
 public override void Write() { Console.Write(“B”); }
}
public class C: B {
 new public virtual void Write() { Console.Write(“C”); }
}
public class D: C {
 public override void Write() { Console.Write(“D”); }
}
...
D d = new D(); C c = d; B b = c; A a = b;
d.Write(); c.Write(); b.Write(); a.Write();

Why doesn’t D Write() override B Write() if the actual object that b is referencing is D?