Asp.net user authorization without password

Question

To authorize users in Asp.net membership, we can call the method

FormsAuthentication.Authenticate(username, password) 

how can I perform the same task (generate a session, cookies and all other employees who make Authanticate) without a user password?

I am trying to login through facebook interface. The Facebook user ID is stored in user data. The user must be signed up as a regular user.

Answer 1

I think you can use the SetAuthCookie method.

more details here http://msdn.microsoft.com/en-us/library/system.web.security.formsauthentication.setauthcookie.aspx