C# windows forms adding more files to playlist

Question

When adding more files to my playlist, it throws an out of bounds exception. It doesn't throw the exception when you load files the first time around. I think the problem is because the playlist.SelectedIndex needs a value placed into it. Any ideas?

private void mediaPlayer_PlayStateChange(object sender, AxWMPLib._WMPOCXEvents_PlayStateChangeEvent e)
{
    if (e.newState == 1)
    {
        if (playlist.SelectedIndex < playlist.Items.Count)
        {
            BeginInvoke(new Action(() => {    
                if ((playlist.SelectedIndex + 1) < playlist.Items.Count)
                {
                     mediaPlayer.URL = paths[playlist.SelectedIndex];
                     playlist.SelectedIndex++;
                }
                else 
                {
                    mediaPlayer.Ctlcontrols.stop();
                }
            }));
        }
    }
}

private void load_button_Click(object sender, EventArgs e)
{
    OpenFileDialog ofd = new OpenFileDialog();
    ofd.Multiselect = true;
    if (ofd.ShowDialog() == DialogResult.OK)
    {
        files = ofd.SafeFileNames;
        paths = ofd.FileNames;
    }

    for (int i =0; i< files.Length; i++)
    {
        playlist.Items.Add(files[i]);
    }

    playlist.SelectedIndex = 0;

}