How to create own dotnet obfuscator

Question

I know that dot net dlls and exe contain their assemblies with them so every body can extract code from it. So please tell me how can i create my own .net obfuscator and if

Answer 1

It's not cheap or easy to write a obfuscator.

If you are paid to develop code, I would seriously consider buying one.

That aside, there is nothing you can do to stop a determined person from access your IP, if you ship it in .exe form. All you can do is slow down a casual developer.