using System;

public class Program

{

    public static void Main()

    {

        var b = new B();

        b.Something();

    }

}

​

​

public class A {

​

    public virtual void Go(){

        Console.WriteLine("A.Go");          

    }

    public void Something(){

        Go();   

    }

}

​

​

public class B: A {

    public override void Go(){

        Console.WriteLine("B.Go");              

    }

}