Fb error validating application

Is there way i can generate ever lasting token which don't expire?i found some posts regarding token expiration but i could not come into conclusion.

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I've been wrestling with this issue for the last two days.

For this Graph Api, call is made with a access token created by my facebook application.

I generate this token by the following way, look my 3rd answer in this question - now in past couple of days one user of my module getting following error - "Error validating access token: Session has expired at unix time 1370094151.

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Here Mudassar Ahmed Khan has explained how to fetch and import Facebook Friends and Contacts along with their profile pictures using Face Book Graph API in ASP. Here Mudassar Ahmed Khan has explain with a tutorial and example, how to get authenticate Face Book user's account and get like User Id, Profile Image, User Name, Name and Email in ASP.