public async Task<List<Multiplex>> LoadMultiplexes()
        {
            var db = new MovieDataService();
            var appSettings = new AppSettingsHelper();
            var lastUpdated = appSettings.DateLastUpdated;
            var result = db.GetMultiplexes();

            if (result.Count == 0 || (DateTime.Now - lastUpdated) > new TimeSpan(0, 0, 10))
            {
                HttpClient client = new HttpClient();
                var response = await client.GetStringAsync(new Uri(MultiplexUri));
                var items = response.ParseMultiplexCollection();
                db.SaveMultiplexes(items);
                appSettings.DateLastUpdated = DateTime.Now;
                result = db.GetMultiplexes();
            }
            return result.OrderBy(x => x.City).ThenBy(y => y.Title).ToList();
        }
        public async Task<List<Movie>> LoadMovies()
        {
            var db = new MovieDataService();
            var appSettings = new AppSettingsHelper();
            var lastUpdated = appSettings.DateLastUpdated;
            var multiplexId = appSettings.MultiplexId;
            var result = db.GetMovies(multiplexId);

            if(result.Count == 0 || (DateTime.Now - lastUpdated) > new TimeSpan(0, 0, 10))
            {
                HttpClient client = new HttpClient();
                var uri = string.Format(MoviesUri, multiplexId);
                var response = await client.GetStringAsync(new Uri(uri));
                var items = response.ParseMovieCollection(multiplexId);
                db.SaveMovies(items, multiplexId);
                appSettings.DateLastUpdated = DateTime.Now;
                result = db.GetMovies(multiplexId);
            }
            return result;
        }