private void Window_Loaded(object sender, RoutedEventArgs e)
        {
            _timer.Tick    += new EventHandler(dispatcherTimer_Tick);
            _timer.Interval = new TimeSpan(0, 0, 2);
            _timer.Start();
            if (MyUserName.Content.ToString() == _dal.CanCreateAdmin().NickName)
            {
                _adminOnline = true;
            }
            else
            {
                _adminOnline = false;
            }
            CreateUsersUI();
            ShowUsersInfo();

            _counter_Users = _dal.GetAllUsers().Count();
        }