public abstract class Pizza
{
    public void prepare()
    {
        Console.WriteLine("Preparing " + this.GetType().Name);
    }

    public void bake()
    {

    }

    public void cut()
    {

    }

    public void box()
    {

    }
}
public class PizzaStore
{
    public Pizza orderPizza(string type)
    {
        Pizza pizza = createPizza(type);
        pizza.prepare();
        pizza.bake();
        pizza.cut();
        pizza.box();
        return pizza;
    }

    public Pizza createPizza(string type)
    {
        Pizza pizza = null;
        if (type == "cheese")
        {
            pizza = new CheesePizza();
        }
        else if (type == "pepperoni")
        {
            pizza = new PepperoniPizza();
        }
        else if (type == "clam")
        {
            pizza = new ClamPizza();
        }
        else if (type == "veggie")
        {
            pizza = new VeggiePizza();
        }
        return pizza;
    }
}

public class VeggiePizza : Pizza
{
}

public class ClamPizza : Pizza
{
}

public class PepperoniPizza : Pizza
{
}

public class CheesePizza : Pizza
{
}