WebExpress.AddBookmark.button_Click C# (CSharp) Method

        private void button_Click(object sender, MouseButtonEventArgs e)
        {
            if (!File.Exists(StaticDeclarations.Bookmarkspath))
            {
                var bookmark = new BookItem();
                bookmark.Title = TitleBox.Text;
                bookmark.Url = _url;
                var bookmarks = new List<BookItem>();
                bookmarks.Add(bookmark);
                var newJson = JsonConvert.SerializeObject(bookmarks);
                File.WriteAllText(StaticDeclarations.Bookmarkspath, newJson);
            }
            else
            {
                var bookmark = new BookItem();
                bookmark.Title = TitleBox.Text;
                bookmark.Url = _url;
                var json = File.ReadAllText(StaticDeclarations.Bookmarkspath);
                var bookmarks = JsonConvert.DeserializeObject<List<BookItem>>(json);
                bookmarks.Add(bookmark);
                var newJson = JsonConvert.SerializeObject(bookmarks);
                File.WriteAllText(StaticDeclarations.Bookmarkspath, newJson);
            }

            ExecuteStoryboard();

            foreach (var tab in mainWindow.Pages)
            {
                tab.startPage.RefreshFavs(mainWindow);
            }
        }