static void CompleteCallback(IAsyncResult result)
            {
                if (result.CompletedSynchronously)
                {
                    return;
                }

                //Async Completion Path.
                Exception completionException = null;
                bool      completeSelf        = true;

                try
                {
                    completeSelf = HandleComplete(result);
                }
                catch (Exception e)
                {
                    if (Fx.IsFatal(e))
                    {
                        throw;
                    }
                    completionException = e;
                }

                if (completeSelf)
                {
                    AcknowledgementCompleteAsyncResult thisPtr = (AcknowledgementCompleteAsyncResult)result.AsyncState;
                    thisPtr.resumableRPC.Resume();
                    thisPtr.Complete(false, completionException);
                }
            }