title: Handling object events inside collections
body: <p>How do I properly handle the events of objects inside a collection?</p>
  
  <p>Example: I have a <code>List&lt;Ping&gt;</code> which asynchronously pings a number of servers. How can I tell if one of the items in the List have called the PingCompleted event? What if I add/remove Ping objects?</p>