static void Main(string[] args) { ObsLib.IPortifolio a = new Portifolio("Hans"); IPortifolioDisplay b = new portifolioDisplay(); Stock stockGoo = new Stock("google", 100.00, 80); Stock stockapl = new Stock("Apple", 200.00, 90); PriceChanger newPricesGoo = new PriceChanger(); PriceChanger newPricesApp = new PriceChanger(); newPricesGoo.priceChanger(stockGoo); newPricesApp.priceChanger(stockapl); a.buyStock(10, stockGoo); a.buyStock(20, stockapl); b.print(a); // stockGoo.Price = 250; a.buyStock(20, stockGoo); b.print(a); Console.ReadLine(); }