using System;
public class Base
{
public virtual void talk()
{
Console.WriteLine("Base");
}
}
public class Derived: Base
{
public override void talk()
{
Console.WriteLine("Derived");
}
}
public class Test
{
public static void Main()
{
Derived d = new Derived();
Base b = d;
b.talk();
Derived d2 = (Derived) b;
object o = d;
Derived d3 = (Derived) o;
}
}
Derived