XapEditor.Xap.populateList C# (CSharp) Method

        void populateList(XapEntry entry)
        {
            string p = (entry == null ? Root : entry.FullPath);
            if (entry != null) entry.Children = new List<XapEntry>();
            foreach(string d in Directory.GetDirectories(p))
            {
                XapEntry e = new XapEntry(d, this, true);
                populateList(e);
                if (entry == null) List.Add(e);
                else entry.Children.Add(e);
            }
            foreach (string f in Directory.GetFiles(p))
            {
                XapEntry e = new XapEntry(f, this, false);
                if (entry == null) List.Add(e);
                else entry.Children.Add(e);
            }
        }
        public void Pack(string fp)