.Net based win application and License issue

i don't know how to implement License technique for any dotnet apps. which will work as a trial version. also like to know how dll library can use License technique as a result only valid user can use that dll....other user can not use just copying to their project. i need a good start as a beginner.....so please point me to some good article on License techniqu开发者_如何学编程e which give in-depth knowledge.

Here is some software that will do what you want and it is highly regarded: http://xheo.com/products/copy-protection?gclid=CN6ruvzh0qgCFYbb4AodwR3_gQ

Basically, for licensing and trial software solutions, you are going to need a third-party utility like the one I listed above. Do your research on which one offers the right choices for you and then purchase it.