public ItemGioHang(int BookID)
{
using (BookOnlineEntities db = new BookOnlineEntities())
{
this.BookID = BookID;
Book book = db.Books.Single(n => n.BookID == BookID);
this.BookName = book.BookName;
this.BookImage = book.BookImage;
this.Price = book.Price;
this.Quantity = 1;
this.Total = Price * Quantity;
}
}