private void RemoveNotification(Notification notification)
 {
     foreach (ConnectionInformation connectionInfo in ConnectionStore.GetConnections(notification.userName))
     {
         connectionInfo.Remove(notification);
     }
 }
        private void UpdateNotificationList()
        {
            IEnumerable <Notification> userNotifications = NotificationStore.GetNotifications(UserIdentity.UserName);

            foreach (ConnectionInformation connectionInfo in ConnectionStore.GetConnections(UserIdentity.UserName))
            {
                connectionInfo.UpdateNotificationList(userNotifications);
            }
        }