public CheckoutBuilder AddProducts(IEnumerable <SaleProduct> products)
{
if (CheckoutProducts == null)
{
CheckoutProducts = new List <SaleProduct>(products);
return(this);
}
CheckoutProducts.AddRange(products);
return(this);
}
private double CheckoutValue()
{
CheckoutTotalValue = 0;
CheckoutProducts.ForEach(P => CheckoutTotalValue += P.Unit_Value * P.Qnt);
return(CheckoutTotalValue);
}
