Red Gate SmartAssembly 6

.NET applications are easy to disassemble if they haven't been obfuscated. SmartAssembly is an obfuscator that helps protect your application against reverse-engineering, cracking, and modification. If you don't want your C# or VB.NET code exposed internationally, or if your entire business rests on the IP embodied in your software, then obfuscating your code becomes a necessity, not a luxury.