title: entity framework update many to many relationship: virtual or not
body: <p>I've been using EF4 (not code-first) since a year, so I'm not really an expert with it. 
  I've a doubt in using many-to-many relationship regarding save n update. </p>
  
  <p>I read somewhere on stackoverflow (i can't find the url anymore) that one solution - to update an existing many-to-many relation - is to not declare "virtual" property; but, if i do this way, the engine can't load dataas with easy loading.</p>
  
  <p>Can you pls explain me the reason? Otherwire, could you please help me in finding some cool docs on this theme?</p>
  
  <p>thx</p>