title: Under what circumstances can ConcurrentBag.TryTake() fail?
body: <p>I'm thinking of using a <a href="http://msdn.microsoft.com/en-us/library/dd381779.aspx" rel="noreferrer">ConcurrentBag</a> in a program I'm writing, however I can't seem to find enough documentation on <a href="http://msdn.microsoft.com/en-us/library/dd381774.aspx" rel="noreferrer">TryTake</a>. </p>
  
  <p>I understand that the method might fail, but I can't find an explanation of the cases in which such failure might happen, and what state the collection will be left in after the failure.</p>
  
  <p>If it's only in the case of another thread having already removed the item then I don't care, but what I can't really afford is the item I want to remove to still be in the collection after the call.  </p>
  
  <p>Can this ever be the case?</p>