static void Main(string[] args)
{
Director director = new Director();
Builder b1= new ConcreteBuilder1();
Builder b2 = new ConcreteBuilder2();
director.Construct(b1);
Product p1 = b1.GetResult();
p1.Show();
director.Construct(b2);
Product p2 = b1.GetResult();
p2.Show();
Console.ReadKey();
}