public override void addItem(AbstractTodo t) { Console.WriteLine("Can not add item from Todo"); }
public override void removeItem(AbstractTodo t) { _todoChild.Remove(t); }
public override void addItem(AbstractTodo t) { _todoChild.Add(t); }
public abstract void removeItem(AbstractTodo t);
// public abstract void getItem(int t); public abstract void addItem(AbstractTodo t);
public override void removeItem(AbstractTodo t) { Console.WriteLine("Can not remove item from Todo"); }