cracking .Net Program

Hello,

I have a .Net application written in C#.

It's very similar to most of the shareware that use "Enter name/key" mechanism to register.

What tools can be used to analyze .Net program?

Any softice breakpoints / tools can be used?

I guess ppl will use obfuscator to mess up the .net assembly first.
Decompiling a .net assembly seems no big use for that.

Any opinions?

Thanks in advance.

I am just a beginner :-)