public override string ToString()
{
return($"Product: {Product.ToString()} \n>>Amount: {Amount} \n>>Price: {PriceNetto} \n>>TaxRate: {TaxRate.ToString()}");
}
public void Add_Event_New(Product p)
{
Add_element(p);
OnCollectionCountChanged(this, new CollectionHandlerEventArgs(this.Name, "Добавлен новый товар", p.ToString()));
}