How can I make my application have a 30 day trial period [duplicate]

This question already has answers here: Create an application that will expire after a trial period [duplicate] (5 answers) Closed 8 years ago.

how to create trial period setup file for 30 days of my c# windows a开发者_Python百科pplication?

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Making C# application a 30 day trial version

http://www.dotnetspider.com/forum/130150-Making-C-application-day-trial-version.aspx

How to add more functionality in setup file? - C#

http://www.daniweb.com/forums/thread226490.html

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One possible solution is to use the registry and write there in some key the installation date. This step is done in the installation time/ first time the application is in use. Then periodically check the current date against the installation date.

You can take also these references:

1. http://www.codeproject.com/KB/cs/Trial_Maker.aspx

2. http://trial.qarchive.org/

3. Using .Net built-in classes