public static CarObserver GetInstance()
{
if (_instance == null)
{
_instance = new CarObserver();
}
return(_instance);
}
public CarList()
{
InitializeComponent();
CarObserver.GetInstance().AddNotifier(this);
}
private void button4_Click(object sender, EventArgs e)
{
object data = "my very important text to nofify";
CarObserver.GetInstance().MakeNotification(data);
}