Add callbacks to when a playback has completed

Hello,

C# 2008 SP1

I am using the following code to record, play, and stop save the recording. Everything works fine. However, I would like to add a call back that will fire when the playback has finished.

I am P/Invoke using the winmm.dll library.

Many thanks for any advice.

Code:

---

public partial class SoundTest : Form
    {
        const uint SND_ASYNC = 0x0001;
        const uint SND_FILENAME = 0x00020000;
        const uint SND_NODEFAULT = 0x0002;

        [DllImport("winmm.dll")]
        private static extern int mciSendString(string lpstrCommand, string lpstrReturnString,
                                                int returnLength, int hwndCallBack);

        [DllImport("winmm.dll")]
        private static extern bool PlaySound(string pszsound, UIntPtr hmod, uint fdwSound);

        public SoundTest()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Disable stop button
            this.btnSaveStop.Enabled = false;
        }

        private void btnRecord_Click(object sender, EventArgs e)
        {
            // Disable play and record button
            this.btnRecord.Enabled = false;
            this.btnPlay.Enabled = false;
            // Enable stop button
            this.btnSaveStop.Enabled = true;

            // Record from microphone
            mciSendString("Open new Type waveaudio Alias recsound", "", 0, 0);
            mciSendString("record recsound", "", 0, 0);   
        }

        private void btnSaveStop_Click(object sender, EventArgs e)
        {
            // Enable play and record
            this.btnRecord.Enabled = true;
            this.btnPlay.Enabled = true;
            // Disable Stop button
            this.btnSaveStop.Enabled = false;
            mciSendString("save recsound c:\\record.wav", "", 0, 0);
            mciSendString("close recsound ", "", 0, 0);
        }

        private void btnPlay_Click(object sender, EventArgs e)
        {
            //// Diable record button while playing back
            //this.btnRecord.Enabled = false;
            PlaySound("c:\\record.wav", UIntPtr.Zero, SND_ASYNC | SND_FILENAME | SND_NODEFAULT); 
        }
    }

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