public void BeginMessageLoop() { while (!done) { Tuple <SendOrPostCallback, object> task = null; lock (items) { if (items.Count > 0) { task = items.Dequeue(); } } if (task != null) { task.Item1(task.Item2); if (InnerException != null) // the method threw an exeption { throw new AggregateException("AsyncHelpers.Run method threw an exception.", InnerException); } } else { workItemsWaiting.WaitOne(); } } }