Protecting my code from reverse engineering

Question

As discussed in similar questions here and here I want to protect my code from reverse engineering.

My situation is as Simucal describes in his (excellent) answer h

Answer 1

Aside from obfuscation it is almost worthless, even Microsoft (ScottGu etc) basically say that people with the right amount of intent and ability will reverse engineer an application and in .NET a basic defense is licensing and IP instead of trying to guard your code through obscurity or some other means of preventing reverse engineering.

That is part of the reasoning of why they released the BCL source instead of keeping it private.