C#

public class Directory : TreeNode
    {
        public string DirName
        {
            get{ return DirName;} 
            set{ 
                DirName = value;
                Name = value;
            }
        }
        public List<note> Notes { get; set; }
        public List<Directory> SubDirectory { get; set; }
        
        #region contructors

        public Directory()
        {
            this.Notes = new List<note>();
            this.SubDirectory = new List<Directory>();
        }

        public Directory( string dirName, List<note> notes )
        {
            this.DirName = dirName;
            this.Notes = new List<note>();
            this.SubDirectory = new List<Directory>();
            this.Notes = notes;
        }

        public Directory( string dirName )
        {
            this.DirName = dirName;
            this.SubDirectory = new List<Directory>();
            this.Notes = new List<note>();
        }
        #endregion

        public Directory getArray()
        {
            if (Notes.Count > 0)
            {
                foreach (note not in Notes)
                {
                    this.Nodes.Add(not);
                }
            }

            if (SubDirectory.Count > 0)
            {
                foreach (Directory dir in SubDirectory)
                {
                    this.Nodes.Add(dir.getArray());
                }
            }
            return this;
        }
    }

public class note : TreeNode
    {
       public string noteName {
            get { return noteName; }
            set { 
                noteName = value;
                Note = value;    
            }
        }
        public string Note { get; set; }
        public int ID { get; set; }

    }