Помогите чайнику

Пытаюсь создать, точнее дублировать, викторину "Угадай мелодию", http://vk.com/id151866126?w=wall151866126_1877%2Fall, но вот застрял на этом фрагменте, подскажыте что не так.
`using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using Microsoft.Win32;

namespace GuestionMelody_3
{
static class Victorina
{
static public List<string> list = new List<string>();
static public int gameDuration = 60;
static public int musicDuration = 10;
static public bool randomStart = false;
static public string lastFoder = "";
static public bool AllDirectories = false;

    static public void ReadMusic()
    {
        string[] music_files = Directory.GetFiles(lastFoder, "*.mp3", AllDirectories ? SearchOption.AllDirectories : SearchOption.TopDirectoryOnly);
        list.Clear();
        list.AddRange(music_files);
    }

    static string regKeyName = "Software\\MyCompanyName\\Victorina";

    public static void WriteParametrs(); 
{
    RegistryKey rk = null;

        try
   {
    rk = Registry.CurrentUser.CreateSubKey(regKeyName);

      if (rk == null) return; 

      rk.SetValue("LastFolder", lastFolder);
      rk.SetValue("RandomStart", randomStart);
      rk.SetValue("GameDuration", gameDuration);
      rk.SetValue("MusicDuration", musicDuration);
      rk.SetValue("AllDirectories", allDirectories);
     }
        finally 
    {
      if (rk ! = null) rk.Close(); 
    }


    } 

}

}
``