title: How to tell if any entities in context are dirty with .Net Entity Framework 4.0
body: <p>I want to be able to tell if there is any unsaved data in an entity framework context. I have figured out how to use the ObjectStateManager to check the states of existing entities, but there are two issues I have with this.</p>
  
  <ol>
  <li>I would prefer a single function to call to see if any entities are unsaved instead of looping though all entities in the context.</li>
  <li>I can't figure out how to detect entities I have added. This suggests to me that I do not fully understand how the entity context works. For example, if I have the ObjectSet myContext.Employees, and I add a new employee to this set (with .AddObject), I do not see the new entity when I look at the ObjectSet and I also don't see the .Count increase. However, when I do a context.SaveChanges(), my new entity is persisted...huh?</li>
  </ol>
  
  <p>I have been unable to find an answer to this in my msdn searches, so I was hoping someone here would be able to clue me in.</p>
  
  <p>Thanks in advance.</p>