using System;

using System.Collections;

public class Program

{

    public static void Main()

    {

        AnyList list = new AnyList();

        list.Add("test");

        list.Add("gimme");

        foreach (var elem in list) {

            Console.WriteLine("Listtype: {0}", elem.ToString());

        }

    }

}

​

class AnyList : ArrayList

{

    public override int Add(object value)

    {

        // Calling the base class GetInfo method:

        base.Add("Header1");

        base.Add("Header2");

        base.Add("Header3");

        return -1;

    }

}