C# อยากรู้วิธีใช้ => ครับใช้แบบไหนบ้าง ยังไง ข้อจำกัด

        public async Task ConnectAsync(MobileServiceUser user)
        {
            _connection = new HubConnection(App.MobileService.ApplicationUri.AbsoluteUri);
            DebugTextWriter writer = new DebugTextWriter();
            _connection.TraceWriter = writer;
            _connection.TraceLevel = TraceLevels.All;
            _connection.Closed += () => writer.WriteLine("hubConnection.Closed");
            _connection.ConnectionSlow += () => writer.WriteLine("hubConnection.ConnectionSlow");
            _connection.Error += (error) => writer.WriteLine("hubConnection.Error {0}: {1}", error.GetType(), error.Message);
            _connection.Reconnected += () => writer.WriteLine("hubConnection.Reconnected");
            _connection.Reconnecting += () => writer.WriteLine("hubConnection.Reconnecting");
            _connection.StateChanged += (change) => writer.WriteLine("hubConnection.StateChanged {0} => {1}", change.OldState, change.NewState);

            if (user != null)
            {
                _connection.Headers["x-zumo-auth"] = user.MobileServiceAuthenticationToken;
            }
            else
            {
                _connection.Headers["x-zumo-application"] = App.MobileService.ApplicationKey;
            }

            _proxy = _connection.CreateHubProxy("SosThailandSignalRHub");

            _proxy.On("AcceptJob", () => SignalR_OnAcceptJob());
            _proxy.On("CloseJob", () => SignalR_OnFinishJob());
            _proxy.On<Log>("SendLog", (log) => SignalR_OnReceiveLog(log));

            await _connection.Start();
        }

        private async void SignalR_OnReceiveLog(BiddingLog log)
        {
            await _dispatcher.RunAsync(CoreDispatcherPriority.Normal, delegate
            {
                if (this.ReceiveLog != null)
                {
                    this.ReceiveLog(this, new SosLogEventArgs(log));
                }
            });
        }

        private async void SignalR_OnAcceptJob()
        {
            await _dispatcher.RunAsync(CoreDispatcherPriority.Normal, delegate
            {
                if (this.AcceptJob != null)
                {
                    this.AcceptJob(this, new EventArgs());
                }
            });
        }

        private async void SignalR_OnFinishJob()
        {            
            await _dispatcher.RunAsync(CoreDispatcherPriority.Normal, delegate
            {
                if (this.FinishJob != null)
                {
                    this.FinishJob(this, new EventArgs());
                }
            });
        }