public void SetBook2Isbn(string book2isbn)
{
book2 = Inventory.FindByIsbn(book2isbn);
}
public void Execute()
{
var book = new Domain.Books.Book { Author = author, Title = title, Isbn = isbn, Price = price };
Inventory.AddBook(book, amount);
}
public void SetBook1Isbn(string book1isbn)
{
book1 = Inventory.FindByIsbn(book1isbn);
}