OK, after the last post I expect many people will nail this, so why don’t you show it your friends that don’t read my blog and see if they pass ;-) 

Create a new instance of Derived, drop the reference, wait for the GC to collect it, and for any finalizers to run.  What is the output? 

And of course, the important question: why?

public class Base

{

    public virtual void DoCleanUp() {

        Console.WriteLine("Do Base's Cleanup");

    }

    ~Base()

    {

        DoCleanUp();

    }

}

public class Derived: Base

{

    public override void DoCleanUp()

    {

        Console.WriteLine("Do Derived Cleanup");

    }

    ~Derived()

    {

        DoCleanUp();

    }

}