public BuyTransaction(User user, DateTime date, Product product) : base(user, date)
{
Product = product;
}
public BuyTransaction BuyProduct(User user, Product product)
{
BuyTransaction buyproduct = new BuyTransaction(user, DateTime.Now, product);
buyproduct.Execute();
transactionlog.WriteTransactionLog(buyproduct);
CompletedTransactions.Add(buyproduct);
return buyproduct;
}