using System;

using foo;

​

public class Program

{

    public static void Main()

    {

        Derived.myMethod();

    }

}

​

namespace foo

{

    public class Base

    {

        protected static string PageURL = "";

        public override string ToString()

        {

            return PageURL;

        }

        public static void myMethod(){

            Console.WriteLine("Hello, World! " + PageURL +" Ooops");        

        }

    }

​

    public class Derived : Base

    {

        static Derived()

        {

            PageURL = "derived-c";

            Console.WriteLine("Called");

        }

    }

}