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how to create demo version of software.............

Posted By:      Posted Date: September 25, 2010    Points: 0   Category :WPF
Hello everybody,
I want to know how to create demo version of a software which works only upto specified time. I have seen many demo version softwares but i think their working is not right because they r based on system time and can be used for more time by changing the system time.

Is their any other method to restrict used after special time?

Can we create a variable in permanent registers which should be incremented after every clock cycle even when system is off and when this varible reaches a specified value, user should be denied to open the software.

I am working in VS2005 windows software.

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