static void Main(string[] args)
{
// Elementler
Control pnl = new Panel();
Control ddl = new DropDownList();
Control txt = new TextBox();
// Visitorlar
IVisitor cv = new ControlsVisitor();
pnl.Accept(cv);
ddl.Accept(cv);
txt.Accept(cv);
IVisitor sv = new StateFullVisitor();
pnl.Accept(sv);
ddl.Accept(sv);
txt.Accept(sv);
Console.ReadKey();
}