public Invoice(string invoiceNumber, string purchaseOrderNumber, decimal total,
DateTime shipDate, DateTime invoiceDate, Customer customer,
IEnumerable<LineItem> items)
{
Total = total;
ShipDate = shipDate;
InvoiceDate = invoiceDate;
InvoiceNumber = invoiceNumber;
PurchaseOrderNumber = purchaseOrderNumber;
Customer = customer;
Items = items;
}
public PurchaseOrder(string number, Customer customer, IEnumerable<LineItem> items)
{
Number = number;
Customer = customer;
Items = items;
}