private void DeleteOrder(Order order) { Orders.Remove (order); }
private bool CanAddLineItem(Order order) { return order != null; }
private bool CanDeleteOrder(Order order) { return order != null; }
private void AddLineItem(Order order) { order.LineItems.Add (new LineItem { Index = order.LineItems.Any () ? order.LineItems.Select (o => o.Index).Max () + 1 : 1, Order = order }); }