how can i add a trial with random serials or single serial and once it get registered expire it after 6-12 months....and also if user change its clock time to some day back it remains expire.....
+1
A:
Read the articles posted in the comment by @JoelCoehoorn first.
If you really want to pursue this after reading the articles, I believe that .NET Licensing might hold an answer to you.
http://windowsclient.net/articles/Licensing.aspx
You would essentially set up your main form as a licensed class.
David Stratton
2010-03-03 15:03:57