public static NotificationGateway GetInstance()
        {
            if (_notificationGateway == null)
            {
                _notificationGateway = new NotificationGateway();
            }

            return(_notificationGateway);
        }
        public static NotificationGateway GetInstance()
        {
            if(_notificationGateway == null)
            {
                _notificationGateway = new NotificationGateway();
            }

            return _notificationGateway;
        }