// add a game to the listbox private void buttonAdd_Click(object sender, EventArgs e) { string output; if (!string.IsNullOrWhiteSpace(textBoxName.Text)) { Game someGame = new Game(); someGame.Name = textBoxName.Text; } else { MessageBox.Show("Enter a game into the textbox you want to add."); textBoxName.Focus(); } if (!string.IsNullOrWhiteSpace(textBoxPrice.Text)) { someGame.Price = double.Parse(textBoxPrice.Text); gameList.Add(someGame); } else { MessageBox.Show("Enter a price into the textbox you want to add."); textBoxPrice.Focus(); } foreach (Game g in gameList) { output = g.Name + " " + g.Price; listBoxGames.Items.Add(output); } textBoxName.Clear(); textBoxPrice.Clear(); textBoxName.Focus(); }