private async void PerformSearch()
        {
            OpenLibraryAPI.SearchResponse response = await searchModel.PerformSearch();

            Books.Clear();
            foreach (var book in response.books)
            {
                var b = new BookViewModel(book);

                b.PropertyChanged += Book_OnNotifyPropertyChanged;
                searchModel.Books.Add(b);
                Books.Add(b);
            }
        }