I came across some interesting C# posts on “null is not false” by Eric Lippert. Thought I would share the links.
Null is not false – Part 1
http://blogs.msdn.com/b/ericlippert/archive/2012/03/26/null-is-not-false.aspx
Null is not false – Part 2
http://blogs.msdn.com/b/ericlippert/archive/2012/04/13/10293219.aspx
Enjoy!