using System;

public class Program

{   

    public static void Main()

    {

        A whoAmI = new B(); //I am created as a new B()! I should be class B, right?

        whoAmI.Func(); //Not really, I am declared as an A and my method was simply hidden, not overridden. 

    }

}

​

public abstract class A

{

    public void Func()

    {

        Console.WriteLine("Hello, I'm class A");

    }

}

​

public class B : A

{

    public void Func()

    {

        Console.WriteLine("Hello, I'm class B");

    }

}