public Product()
{
iSBN = 00;
title = "";
unitprice = 00;
yearpublished = 0000;
qOH = 0000;
catofB = EnumCatofBooks.Undefined;
catofS = EnumCatofSoftware.Undefined;
}
public Product(int iSBN, string title, double unitprice, int yearpublished, int qOH,
EnumCatofBooks catofB, int authorid, string authorfn, string authorln)
: base(authorid, authorfn, authorln)
{
ISBN = iSBN;
Title = title;
Unitprice = unitprice;
Yearpublished = yearpublished;
QOH = qOH;
CatofB = catofB;
}