// End of Initialization private void FormStore_Load(object sender, EventArgs e) { List <Book> books = DataMan.GetBooks(); List <Game> games = DataMan.GetGames(); listboxBooks.Items.Clear(); foreach (Book book in books) { listboxBooks.Items.Add(book); } // End of Foreach listboxGames.Items.Clear(); foreach (Game game in games) { listboxGames.Items.Add(game); } // End of Foreach }