public void AddItem(Book book, int quantity)
{
CartLine line = lineCollection.Where(b => b.Book.Id == book.Id).FirstOrDefault();
if(line == null)
{
lineCollection.Add(new CartLine { Book = book, Quantity = quantity });
}
else
{
line.Quantity += quantity;
}
}
public void RemoveLine(Book book)
{
lineCollection.RemoveAll(l => l.Book.Id == book.Id);
}
