static void Main(string[] args)
{
ObjectStructure o = new ObjectStructure();
o.Anexar(new ConcreteElementA());
o.Anexar(new ConcreteElementB());
ConcreteVisitor1 v1 = new ConcreteVisitor1();
ConcreteVisitor2 v2 = new ConcreteVisitor2();
o.Accept(v1);
o.Accept(v2);
Console.ReadKey();
}