algorithm for expiration date of trial software using C#

[sparton]

hi! can anyone show me how to make an expiration for a certain
software where backtracking of dates (i.e. changing the system date)
will not nullify the license.. also, the software will have a counter
which counts how many times the software is being used.. thanks!!

[Mohamoss]

RE: algorithm for expiration date of trial software using C#

Hi
If you want to use the idea of counter, you just need to have a variable
(int) that you save somewhere in a file of those or your application or on
in registry key , you increment that variable in the closing event of
the main form in your application and you check it in the load event
handler ( to make sure the max number of allowed usage time is not
exceeded
Mohamed Mahfouz
MEA Developer Support Center
ITworx on behalf of Microsoft EMEA GTSC