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I had developped trail version in WPF application.i want to prevent the additional trail installation after trail expire such as do not install the trail version again on same machine..
please help me in simple way
Updated 12-Mar-14 1:33am

I would read one (or more) of the CodeProject articles [^] on the argument.
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There is a good article here in Code Project that explains licensing for .NET application. I suggest that you read it thoroughly.

Creating Secure Trial Versions for .NET Applications - A Tutorial[^]

Good luck.
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