.NET object events and dispose / GC

Question

EDIT: After Joel Coehoorns excellent answer, I understand that I need to be more specific, so I modified my code to be closer to thing I\'m trying to unders

Answer 1

I would have my class B implements IDisposable as well and in it's dispose routine, I would first check whether A is not null and then dispose A. By using this approach you have to just make sure to dispose the last of your class and the internals will handle all other dispose.