private void UnregisterOnServer() { var lService = new WindowsPhonePushProviderService_AsyncProxy(message, clientChannel); lService.BeginUnregisterDevice(deviceId.ToString(), ar => { try { lService.EndUnregisterDevice(ar); Log("Device unsubscribed from notifications.\n"); } catch (Exception ex) { Log("Exception during unsivscribing.\n{0}", ex.Message); } }, null); }