title: How to declare one to one relationship using Entity Framework 4 Code First (POCO)
body: <p>How to declare a one to one relationship using Entity Framework 4 Code First (POCO)?</p>
  
  <p>I found <a href="https://stackoverflow.com/questions/2089395/one-to-one-relationships-in-entity-framework-4-v2-with-poco">this question (one-to-one relationships in Entity Framework 4) </a>, but the article that the answer references was not useful (there is one line of code that is a 1-1 relationship, but no mention of how to define it).</p>