C# event not being handled

Question

I'm learning C# event handling by writing an app that uses the iTunes COM API. I have a method that should run when iTunes stops playing a song, but the method is never getting called when I trigger the event in the app by hitting the "stop/pause" button.

EDIT: Based on dboarman's reply, I deleted the while loop. Now the event does get handled, but only if I restart iTunes prior to running PlayPlaylist(). If I run PlayPlaylist() a second time, the stop event no longer gets fired/handled.

void trayIcon_Click(object sender, EventArgs e)
{
    PlayPlaylist();
}

public static void PlayPlaylist()
{

    itapp = new iTunesApp();
    itapp.OnPlayerStopEvent += 
        new _IiTunesEvents_OnPlayerStopEventEventHandler(itapp_OnPlayerStopEvent);

    lastPlaylist = itapp.LibraryPlaylist;

    itapp.Play();            
}

static void itapp_OnPlayerStopEvent(object iTrack)
{
    Debug.WriteLine("Stop Event fired");
    //...
}

Updated source in Pastebin here (lines 59-68 are the relevant ones).

Spec: My app is supposed to play the songs in a Genius recommendations playlist from first to last (iTunes by default doesn't play Genius recommendations consecutively). The StopEvent should trigger the next song in the list to play.

Answer 1

When your itapp goes out of scope, be sure to release it with

System.Runtime.InteropServices.Marshal.ReleaseComObject(itapp);

or you'll have to restart iTunes for it to work again. Unregistering the event handlers with -= probably wouldn't hurt either.