title: C# version of CopyOnWriteArrayList
body: <p>We do not have C# version of <a href="http://docs.oracle.com/javase/1.5.0/docs/api/java/util/concurrent/CopyOnWriteArrayList.html" rel="nofollow">CopyOnWriteArrayList</a> in standard library. Is there any other open source library available?</p>