How to obfuscate a DLL in .NET?

whatis obfuscate in .NET?? Code access security is alternative of obfuscate.
Obfuscate = it the process of scrambling and encrypting the software so that it CAN NOT be easily reversed engineered. The goal is to stop casual hacking to crack the code.


here is some good links
http://www.csharp411.com/net-obfuscators/