title: How to redirect and auto login user
body: <p>How can I redirect a user from one Asp.net Mvc site to another Asp.net MVC site and automatically log them in? </p>
  
  <p>The situation is that we will have some customers that need to go to one site and some that will need to go to the other.   I've been asked to make it so that when customers are redirected to the correct site that they are also auto logged in to the site they are redirected to.  </p>