private void DeRegisterForNotifications()
        {
            try
            {
                // De-Register for IMbnInterfaceManagerEvents
                if (m_InterfaceManagerEventsSink != null)
                {
                    m_InterfaceManagerEventsSink.Dispose();
                    m_InterfaceManagerEventsSink = null;
                }

                // De-Register for IMbnPinManagerEvents
                if (m_PinManagerEventsSink != null)
                {
                    m_PinManagerEventsSink.Dispose();
                    m_PinManagerEventsSink = null;
                }

                // De-Register for IMbnPinManagerEvents
                if (m_PinEventsSink != null)
                {
                    m_PinEventsSink.Dispose();
                    m_PinEventsSink = null;
                }

                // De-Register for IMbnConnectionEvents
                if (m_ConnectionEventsSink != null)
                {
                    m_ConnectionEventsSink.Dispose();
                    m_ConnectionEventsSink = null;
                }

                // De-Register for IMbnDeviceServicesEvents
                if (m_DeviceServicesEventsSink != null)
                {
                    m_DeviceServicesEventsSink.Dispose();
                    m_DeviceServicesEventsSink = null;
                }
            }
            catch (Exception e)
            {
                rootPage.NotifyUser(ParseExceptionCode(e), NotifyType.ErrorMessage);
            }
        }