Simple typeof question

Is there a better way to do this, where C:B:A:

Code:

---

if (X.GetType().IsSubclassOf(typeof(A)) ||
    X.GetType() == typeof(A))
{
    A bob = (A)X;
}

---

The problem with IsSubclassOf() is that if the type is A, it returns false.

Code:

---

if(X is A) { ... }

---

Can't get much more simple than that. Cheers!

Code:

---

A bob = X as A;
if (bob != null)
{
  (...)
}

---