public async Task RetrieveFavoritesAsync()
        {
            var favorites = await AudiojungleWebService.GetFavoritesAsync();

            Favorites = new ObservableCollection <AudioItem>(favorites);

            RetrieveFavoritesAsync(2);
        }
        private async void RetrieveFavoritesAsync(int page)
        {
            var favorites = await AudiojungleWebService.GetFavoritesAsync(page);

            if (favorites.Count > 0)
            {
                foreach (var item in favorites)
                {
                    Favorites.Add(item);
                }

                RetrieveFavoritesAsync(page + 1);
            }
        }