Generate “never-expire” access token for Facebook Page

Question

I have managed to post to Facebook Page via API (C#), but when administrator of the page logs out, the following error occurs:

\"(OAuthException - #190) Error valida

Answer 1

1. Generate long-lived token for admin of the fan page http://appdevresources.blogspot.sg/2012/11/extend-facebook-access-token-make-it.html (nice explanation with images)
2. Generate long-lived token for fan page itself http://appdevresources.blogspot.sg/2012/11/retrieving-facebook-page-id-and.html
3. Use token from 2) to post on the fan page's wall (no need for Facebook Login dialog)
4. Resulted token will never expire (even if administrator of the fan page did log out)