public CityMuseumViewModel(INavigation navigation, bool?IsConnected = null)
 {
     Navigation       = navigation;
     repository       = new CityMuseumRepository(new CityDBContext());
     neighbourrepo    = new NeighbourhoodRepository();
     reviewRepository = new CityReviewRepository();
     if (IsConnected != null)
     {
         isOnline = (bool)IsConnected;
     }
     else
     {
         isOnline = isConnected();
     }
 }
 public CityShopViewModel(INavigation navigation, bool?isConn = null)
 {
     Navigation       = navigation;
     repository       = new CityShoppingRepository(new Data.CityDBContext());
     neighbourrepo    = new NeighbourhoodRepository();
     reviewRepository = new CityReviewRepository();
     if (isConn != null)
     {
         isOnline = (bool)isConn;
     }
     else
     {
         isOnline = isConnected();
     }
 }
        public CityEventViewModel(INavigation navigation, bool?connectLive)
        {
            Navigation       = navigation;
            repository       = new CityEventRepository(new CityDBContext());
            neighbourrepo    = new NeighbourhoodRepository();
            reviewRepository = new CityReviewRepository();

            if (connectLive.HasValue)
            {
                isOnline = (bool)connectLive;
            }
            else
            {
                isOnline = isConnected();
            }
        }