static void Main(string[] args)
{
Stock ibm = new Stock("IBM", 120);
ibm.Attach(new Investor("Sorros"));
ibm.Attach(new Investor("Bekshire"));
ibm.Price = 120.10;
ibm.Price = 121;
Console.ReadKey();
}
static void Main(string[] args)
{
Stock stock = new Stock("Cheese");
stock.NoOfItemsInStock = 10; // Register observers.
Seller seller = new Seller();
stock.Attach(seller);
Buyer buyer = new Buyer();
stock.Attach(buyer);
stock.NoOfItemsInStock = 4;
//stock.NoOfItemsInStock = 1;
Console.ReadKey();
}