static void Main(string[] args)
        {
            StockManager    stockManager    = new StockManager();
            BuyStock        buyStock        = new BuyStock(stockManager);
            SellStock       sellStock       = new SellStock(stockManager);
            StockController stockController = new StockController();

            stockController.TakeOrder(buyStock);
            stockController.TakeOrder(sellStock);
            stockController.TakeOrder(buyStock);
            stockController.PlaceOrders();
        }
 public SellStock(StockManager stockManager)
 {
     _stockManager = stockManager;
 }
 public BuyStock(StockManager stockManager)
 {
     _stockManager = stockManager;
 }