title: Asp.net Memebership Authorization without password
body: <p>To authanticate users in Asp.net Membership we can call method </p>
  
  <pre><code>FormsAuthentication.Authenticate(username, password)
  </code></pre>
  
  <p>how can I do the same job (generate session, cookies and all other staff that Authanticate does) without users password?</p>
  
  <p>I'm trying to login user over facebook connect. User's facebook id is stored within the users data. User should be signed in like a normal user.</p>