private void button3Delete_Click(object sender, EventArgs e) { if (listBox3Users.SelectedIndex > 0) { dataLayer.User user = (dataLayer.User)listBox3Users.SelectedItem; // no delete admin if (user.UserId == 1) { MessageBox.Show(this, "Cannot delete admin.", "Error"); } else { if (user.Delete()) { MessageBox.Show(this, "User Deleted.", "Success"); PopulateUserPage(); } else { MessageBox.Show(this, "Cannot delete user.", "Error"); } } } }