public void Detach()
{
_list.Changed -= new ChangedEventHandler(ListChanged);
_list = null;
}
static void Main()
{
ListWithCahngedEvent list = new ListWithCahngedEvent();
EventListener listener = new EventListener(list);
list.Add("obj1");
list.Add("obj2");
}
public EventListener(ListWithCahngedEvent list)
{
_list = list;
_list.Changed += new ChangedEventHandler(ListChanged);
}