Kuckucks Uhr in C#

using System;

using System.Runtime.InteropServices;

using System.Text;

using System.Windows.Forms;

namespace Uhr

{

    public partial class Form1 : Form

    {

        [DllImport("winmm.dll", EntryPoint = "mciSendStringA", CharSet = CharSet.Ansi)]

        protected static extern int mciSendString

        (string mciCommand,

        StringBuilder returnValue,

        int returnLength,

        IntPtr callback);

        [DllImport("kernel32.dll")]

        public static extern bool Beep(int frequency, int duration);

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            for (int i = 0; i < DateTime.Now.Hour; i++)

            {

                mciSendString("set cdaudio door open", null, 0, IntPtr.Zero);

                Beep(1000, 1000);

                mciSendString("set cdaudio door closed", null, 0, IntPtr.Zero);

            }

        }

    }

}