private async Task<IMobileServiceSyncTable<DerivedDataEntity>> GetTableAsync(MobileServiceSQLiteStore store)
        {
            store.DefineTable<DerivedDataEntity>();
            MobileServiceClient client = null;
#if WIN_APPS
            client = new MobileServiceClient((string)ApplicationData.Current.LocalSettings.Values["MobileAppUrl"]);
#else
            client = new MobileServiceClient(ConfigurationManager.AppSettings["MobileAppUrl"]);
#endif
            client.InitializeExpressFileSyncContext(store);
            await client.SyncContext.InitializeAsync(store);
            return client.GetSyncTable<DerivedDataEntity>();
        }