static void Main(string[] args)
{
var derived1 = new Derived1();
var derived2 = new Derived2();
derived1.Print();
derived2.Print();
}
public static void Main()
{
Derived2 d2 = new Derived2();
Base @base = d2;
Derived1 d1 = d2;
@base.Print();
@base.PrintA();
@base.PrintB();
d1.Print();
d1.PrintA();
d1.PrintB();
}