void Main(){    Template ta = new ProductA();    Template tb = new ProductB();    ta.Show();    tb.Show();}abstract class Template{    public void Show(){        string.Format("Template->{0}",GetName()).Dump();    }    protected abstract string GetName();}class ProductA:Template{    protected override string GetName(){return "A";}}class ProductB:Template{    protected override string GetName(){return "B";}}