I work on windows desktop application using c#
I need to sell my app so I need to protect him using license for 30 day
then after that client can't use my app as trial version
so what best technology or technique that can do that as free library ?
What I have tried:
I stored key and value on registry and every time I start my app i compare it with value on register so are this good idea for 30 day trial or there are another thing best