Stackoverlow.com answer to the question: http://stackoverflow.com/questions/15318438/building-a-tree-menu-with-recursion-in-mvc4-which-data-structure-to-use

SO.15318438.cs

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

namespace SO.15318438
{
    class Program
    {
        static void Main(string[] args)
        {
            BoxNode boxNode = new BoxNode(){BoxChildren = new List<Box>()};
            boxNode.BoxChildren.Add(new Box(){BoxNode = null, Name = "1Level1_0C" });
            boxNode.BoxChildren.Add(new Box() { BoxNode = 
                new BoxNode() { BoxChildren = new List<Box>() { new Box() { BoxNode = null, Name = "2Level1_0C" }, new Box() { BoxNode = null, Name = "2Level2_0C" } } }, 
                Name = "1Level2_2C" });

            CreateMenuTree(boxNode, " ");

            Console.ReadLine();
        }

        public static void CreateMenuTree(BoxNode boxNode, string indent)
        {
            foreach (Box box in boxNode.BoxChildren)
            {
                Console.WriteLine(indent + box.Name);

                if (box.BoxNode != null && box.BoxNode.BoxChildren != null && box.BoxNode.BoxChildren.Count > 0)
                {
                    CreateMenuTree(box.BoxNode, indent + indent);
                }
            }
        }
    }

    public class BoxNode
    {
        public List<Box> BoxChildren
        {
            get;
            set;
        }
    }

    public class Box
    {
        public string Name
        {
            get;
            set;
        }

        public BoxNode BoxNode
        {
            get;
            set;
        }
    }
}