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//Namespace reference
using System.IO


/// <summary>
/// method to populate our TreeView with the files from
/// our music directory
/// </summary>
/// <param name="tv">TreeView control to populate</param>
public void PopulateMusicLibrary(string dir,TreeView tv)
{
    //extensions we want to load
    string[] extensions = { ".mp3", ".wma", ".mp4", ".wav" };
    DirectoryInfo _rootDir = new DirectoryInfo(dir);
    try
    {
        tv.BeginUpdate();
        tv.Nodes.Clear();
        //loop thorugh the directory provided gathering all the top level directories (artists)
        foreach (DirectoryInfo artistDir in _rootDir.GetDirectories())
        {
            //create a tree node for each artist
            TreeNode artistNode = new TreeNode(artistDir.FullName.Substring(artistDir.FullName.LastIndexOf(Path.DirectorySeparatorChar) + 1));
            //loop thorugh each top level directory (artists) to get all it's subdirectories (albums)
            foreach (DirectoryInfo albumDir in artistDir.GetDirectories())
            {
                //create a tree node for each album
                TreeNode albumNode = new TreeNode(albumDir.Name.Replace("Parental Advisory", ""));
                //loop through each subdirectory (albums) getting the files in each (songs)
                foreach (FileInfo song in albumDir.GetFiles())
                {
                    //loop through our extensions array
                    for (int i = 0; i < extensions.Length; i++)
                    {
                        //make sure the file has an extension we're looking for
                        if (song.Name.EndsWith(extensions[i]))
                        {
                            //add a new child node for each subdirectory (album)
                            albumNode.Nodes.Add(new TreeNode(song.Name.Replace("'", "\'")));
                        }
                    }
                }
                //add each subdirectory (album) to its corresponding top level directory (artists)
                artistNode.Nodes.Add(albumNode);
            }
            //add the nodes to the TreeView
            tv.Nodes.Add(artistNode);
        }
        tv.EndUpdate();
        //collapse all the nodes
        tv.CollapseAll();
    }
    //catch any exceptions that may have occurred
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message);
    }
}

//Example usage
PopulateMusicLibrary("C:\\MyMusic",treeView1)