public Pizza CreatePizza(string type)
{
Pizza pizza = null;
switch (type)
{
case "cheese": pizza = new CheesePizza(); break;
case "pepperoni": pizza = new PepperoniPizza(); break;
case "clam": pizza = new ClamPizza(); break;
case "veggie": pizza = new VeggiePizza(); break;
}
Console.WriteLine(pizza);
return pizza;
}