Quick Puzzle: what does this program print?

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You have 30 seconds left... just kidding :-)

 

using System;

using System.Collections;

using System.Reflection;

class Hello

{

    Type Unknown { get { return World.GetType(); } }

    object[] Knowledge() { return Unknown.GetProperties(); }

    string[] Library()

    {

        return Array.ConvertAll<object, string>(

            Knowledge(),

            delegate(object x) { return x.ToString(); });

    }

    public static Hello World { get { return new Hello(); } }

    static void Main(string[] args)

    {

        if (args.Length > 0)

            Console.WriteLine(args[0]);

        else

            Main(World.Library());

    }

}

 

[update. The code above compiles only with the C# 2.0 compiler. The simplest way to get started is to download Visual C# Express from here]