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    <p>go through approach 1, then wrape all context event (open, opened, faulted, ...) into event to be exposed by your class proxy, once the communication is faulted then re-create the proxy or call some recursive method inside proxy class. i can share with you some wok i have just tested.</p> <pre><code> public class DuplexCallBackNotificationIntegrationExtension : IExtension, INotificationPusherCallback { #region - Field(s) - private static Timer _Timer = null; private static readonly object m_SyncRoot = new Object(); private static readonly Guid CMESchedulerApplicationID = Guid.NewGuid(); private static CancellationTokenSource cTokenSource = new CancellationTokenSource(); private static CancellationToken cToken = cTokenSource.Token; #endregion #region - Event(s) - /// &lt;summary&gt; /// Event fired during Duplex callback. /// &lt;/summary&gt; public static event EventHandler&lt;CallBackEventArgs&gt; CallBackEvent; public static event EventHandler&lt;System.EventArgs&gt; InstanceContextOpeningEvent; public static event EventHandler&lt;System.EventArgs&gt; InstanceContextOpenedEvent; public static event EventHandler&lt;System.EventArgs&gt; InstanceContextClosingEvent; public static event EventHandler&lt;System.EventArgs&gt; InstanceContextClosedEvent; public static event EventHandler&lt;System.EventArgs&gt; InstanceContextFaultedEvent; #endregion #region - Property(ies) - /// &lt;summary&gt; /// Interface extension designation. /// &lt;/summary&gt; public string Name { get { return "Duplex Call Back Notification Integration Extension."; } } /// &lt;summary&gt; /// GUI Interface extension. /// &lt;/summary&gt; public IUIExtension UIExtension { get { return null; } } #endregion #region - Constructor(s) / Finalizer(s) - /// &lt;summary&gt; /// Initializes a new instance of the DuplexCallBackNotificationIntegrationExtension class. /// &lt;/summary&gt; public DuplexCallBackNotificationIntegrationExtension() { CallDuplexNotificationPusher(); } #endregion #region - Delegate Invoker(s) - void ICommunicationObject_Opening(object sender, System.EventArgs e) { DefaultLogger.DUPLEXLogger.Info("context_Opening"); this.OnInstanceContextOpening(e); } void ICommunicationObject_Opened(object sender, System.EventArgs e) { DefaultLogger.DUPLEXLogger.Debug("context_Opened"); this.OnInstanceContextOpened(e); } void ICommunicationObject_Closing(object sender, System.EventArgs e) { DefaultLogger.DUPLEXLogger.Debug("context_Closing"); this.OnInstanceContextClosing(e); } void ICommunicationObject_Closed(object sender, System.EventArgs e) { DefaultLogger.DUPLEXLogger.Debug("context_Closed"); this.OnInstanceContextClosed(e); } void ICommunicationObject_Faulted(object sender, System.EventArgs e) { DefaultLogger.DUPLEXLogger.Error("context_Faulted"); this.OnInstanceContextFaulted(e); if (_Timer != null) { _Timer.Dispose(); } IChannel channel = sender as IChannel; if (channel != null) { channel.Abort(); channel.Close(); } DoWorkRoutine(cToken); } protected virtual void OnCallBackEvent(Notification objNotification) { if (CallBackEvent != null) { CallBackEvent(this, new CallBackEventArgs(objNotification)); } } protected virtual void OnInstanceContextOpening(System.EventArgs e) { if (InstanceContextOpeningEvent != null) { InstanceContextOpeningEvent(this, e); } } protected virtual void OnInstanceContextOpened(System.EventArgs e) { if (InstanceContextOpenedEvent != null) { InstanceContextOpenedEvent(this, e); } } protected virtual void OnInstanceContextClosing(System.EventArgs e) { if (InstanceContextClosingEvent != null) { InstanceContextClosingEvent(this, e); } } protected virtual void OnInstanceContextClosed(System.EventArgs e) { if (InstanceContextClosedEvent != null) { InstanceContextClosedEvent(this, e); } } protected virtual void OnInstanceContextFaulted(System.EventArgs e) { if (InstanceContextFaultedEvent != null) { InstanceContextFaultedEvent(this, e); } } #endregion #region - IDisposable Member(s) - #endregion #region - Private Method(s) - /// &lt;summary&gt; /// /// &lt;/summary&gt; void CallDuplexNotificationPusher() { var routine = Task.Factory.StartNew(() =&gt; DoWorkRoutine(cToken), cToken); cToken.Register(() =&gt; cancelNotification()); } /// &lt;summary&gt; /// /// &lt;/summary&gt; /// &lt;param name="ct"&gt;&lt;/param&gt; void DoWorkRoutine(CancellationToken ct) { lock (m_SyncRoot) { var context = new InstanceContext(this); var proxy = new NotificationPusherClient(context); ICommunicationObject communicationObject = proxy as ICommunicationObject; communicationObject.Opening += new System.EventHandler(ICommunicationObject_Opening); communicationObject.Opened += new System.EventHandler(ICommunicationObject_Opened); communicationObject.Faulted += new System.EventHandler(ICommunicationObject_Faulted); communicationObject.Closed += new System.EventHandler(ICommunicationObject_Closed); communicationObject.Closing += new System.EventHandler(ICommunicationObject_Closing); try { proxy.Subscribe(CMESchedulerApplicationID.ToString()); } catch (Exception ex) { Logger.HELogger.DefaultLogger.DUPLEXLogger.Error(ex); switch (communicationObject.State) { case CommunicationState.Faulted: proxy.Close(); break; default: break; } cTokenSource.Cancel(); cTokenSource.Dispose(); cTokenSource = new CancellationTokenSource(); cToken = cTokenSource.Token; CallDuplexNotificationPusher(); } bool KeepAliveCallBackEnabled = Properties.Settings.Default.KeepAliveCallBackEnabled; if (KeepAliveCallBackEnabled) { _Timer = new Timer(new TimerCallback(delegate(object item) { DefaultLogger.DUPLEXLogger.Debug(string.Format("._._._._._. New Iteration {0: yyyy MM dd hh mm ss ffff} ._._._._._.", DateTime.Now.ToUniversalTime().ToString())); DBNotificationPusherService.Acknowledgment reply = DBNotificationPusherService.Acknowledgment.NAK; try { reply = proxy.KeepAlive(); } catch (Exception ex) { DefaultLogger.DUPLEXLogger.Error(ex); switch (communicationObject.State) { case CommunicationState.Faulted: case CommunicationState.Closed: proxy.Abort(); ICommunicationObject_Faulted(null, null); break; default: break; } } DefaultLogger.DUPLEXLogger.Debug(string.Format("Acknowledgment = {0}.", reply.ToString())); _Timer.Change(Properties.Settings.Default.KeepAliveCallBackTimerInterval, Timeout.Infinite); }), null, Properties.Settings.Default.KeepAliveCallBackTimerInterval, Timeout.Infinite); } } } /// &lt;summary&gt; /// /// &lt;/summary&gt; void cancelNotification() { DefaultLogger.DUPLEXLogger.Warn("Cancellation request made!!"); } #endregion #region - Public Method(s) - /// &lt;summary&gt; /// Fire OnCallBackEvent event and fill automatic-recording collection with newest /// &lt;/summary&gt; /// &lt;param name="action"&gt;&lt;/param&gt; public void SendNotification(Notification objNotification) { // Fire event callback. OnCallBackEvent(objNotification); } #endregion #region - Callback(s) - private void OnAsyncExecutionComplete(IAsyncResult result) { } #endregion } </code></pre>
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