NFe.Components.FTP.ListDirectories C# (CSharp) Method

        public ArrayList ListDirectories()
        {
            ArrayList list = new ArrayList();

            foreach (string f in List())
            {
                //FILIPE MADUREIRA
                //In Windows servers it is identified by <DIR>
                if (f.Length > 0)
                {
                    if ((f[0] == 'd') || (f.ToUpper().IndexOf("<DIR>") >= 0))
                        list.Add(f);
                }
            }

            return list;
        }
        /// <summary>