static void Main()
{
Console.WriteLine("Command Patter [Start]");
var stock = new Stock();
var sellObject = new SellStock(stock);
var buyObject = new BuyStock(stock);
var broker = new Broker();
broker.TakeOrder(sellObject);
broker.TakeOrder(buyObject);
broker.TakeOrder(buyObject);
broker.TakeOrder(sellObject);
broker.PlaceOrder();
Console.WriteLine("Command Patter [End]");
Console.Read();
}