login with facebook account on my asp.net website membership

We have created login feature using asp.net membership. meawhile, we have a table called member that store profile.memberId, first, last name, email. ect. so member can have their information displayed on their page. if we implement facebool login, the challenge will be define profile.memberId and User.Identity.IsAuthenticated. these are in some pages of code behind. It may not work under facebook login. any suggestions??

Source: http://forums.asp.net/p/1919765/5445889.aspx/1?login+with+facebook+account+on+my+asp+net+website+membership

nyc marathon willie nelson khloe kardashian Wreck It Ralph Movember USC shooting halloween