using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication60
{
    class Program
    {
        static void Main(string[] args)
        {
            Folder currentFolder = new Folder("D:\\Folder1\\Folder2");
            Folder parentFolder = new Folder("D:\\Folder1");
            Folder childFolder = new Folder("D:\\Folder1\\Folder2\\Folder3");

            parentFolder.ChildFolder = currentFolder;
            parentFolder.ParentFolder = null;
            currentFolder.ChildFolder = childFolder;
            currentFolder.ParentFolder = parentFolder;
            childFolder.ParentFolder = currentFolder;
            childFolder.ChildFolder = null;

            Console.WriteLine(currentFolder.Path);
            Console.WriteLine(currentFolder.ParentFolder.ChildFolder.Path);
        }
    }

    class Folder
    {
        public Folder(string cur)
        {
            Path = cur;
        }

        public string Path
        {
            get;
            set;
        }

        public Folder ParentFolder
        {
            get;
            set;
        }

        public Folder ChildFolder
        {
            get;
            set;
        }
    }
}