using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var Persons = new List<Person>();

        Persons.Add(new Person("Eric"));

        Persons[0].Childs = new List<Person>();

        Persons[0].Childs.Add(new Person("Tom"));

        Persons[0].Childs.Add(new Person("John"));

        Persons[0].Childs[0].Childs = new List<Person>();

        Persons[0].Childs[0].Childs.Add(new Person("Bill"));

        Persons.Add(new Person("John"));

        DisplayPerson(Persons);

    }

​

    public class Person

    {

        public Person(string name)

        {

            this.Name = name;

        }

​

        public string Name {get;set;}

        public List<Person> Childs{get;set;}

    }

​

    public static void DisplayPerson(List<Person> persons)

    {

        if (persons != null)

        {

            Stack<Person> personStack = new Stack<Person>();

            int level = 1;

            persons.ForEach(personStack.Push);

            while (personStack.Count > 0)

            {

                Person item = personStack.Pop();

                Console.WriteLine("-" + item.Name + ", Level:" + level); 

                if (item.Childs != null)

                {

                    item.Childs.ForEach(personStack.Push);

                    level++;

                }

            }

        }

    }

}