ok here is all the code for you get a better idea of what i'm trying to do
Code:
namespace Playing_MP3_songs
{
    public partial class CreatePlaylistForm : Form
    {
        [DllImport("winmm.dll")]
        private static extern long mciSendString(string strCommand, StringBuilder strReturn, int iReturnLength, IntPtr hwndCallback);
        bool paused = false;
        ArrayList myPlaylistsCollection = new ArrayList();

        public CreatePlaylistForm()
        {
            InitializeComponent();
            // DirectoryInfo dinfo = new DirectoryInfo(@"C:\Users\Public\Music\Sample Music");
            DirectoryInfo dinfo = new DirectoryInfo(@"C:\music");
            FileInfo[] Files = dinfo.GetFiles("*.mp3");
            foreach (FileInfo file in Files)
            {
                LibraryTracks.Items.Add(file.Name);
            } 
        }

        private void button2_Click(object sender, EventArgs e) //add track
        {
            foreach(string name in PlaylistTracks.Items )
            {
                if (LibraryTracks.SelectedItem.ToString() == name)
                {
                    MessageBox.Show("Song already in playlist");
                    return;
                }
             
            }
           PlaylistTracks.Items.Add(LibraryTracks.SelectedItem);
        }

        private void button3_Click(object sender, EventArgs e) //remove track
        {
           
           PlaylistTracks.Items.Remove(PlaylistTracks.SelectedItem);
      
        }

        private void button1_Click(object sender, EventArgs e) //create playlist
        {
            Playlist temp = new Playlist(textBoxPlaylist.Text);
            foreach(string name in PlaylistTracks.Items)
            {
                temp.addSong(name);
           
            }

        }

    }
}
and looking at the image of what form the first listbox is populated from a folder called music. The second listbox is for the playlist. The add/remove buttons add or remove the songs to the second listbox. I want the create button to save the selection of songs in the second listbox and the name in the textbox.
I then have another form where I want the names of the playlists to be displayed in