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, int level = 0)

    {

        if (persons != null)

        {

            level++;

            foreach (Person item in persons)

            {

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

                DisplayPerson(item.Childs, level);

            }

        }

    }

}