using System;
using System.Collections;
using System.Collections.Generic;

namespace ConsoleApplication2
{
    class Program
    {
        static void Main(string[] args)
        {
            var rootPerson = new Person { Name = "Roma", Sex = true };
            var root = new TreeElement<Person>(rootPerson);
            var childrenPerson = new Person { Name = "Olia", Sex = false};
            root.Children.Add(new TreeElement<Person>(childrenPerson));
            childrenPerson = new Person { Name = "Sasha", Sex = true };
            root.Children.Add(new TreeElement<Person>(childrenPerson));
            RecursivePrint(root);
            Console.ReadKey();
        }
        public static void RecursivePrint(TreeElement<Person> root, int level = 0)
        {
            for (var i = 0; i < level; i++)
                Console.Write("\t");
            Console.WriteLine("Name: {0}, Sex: {1}", root.Value.Name, root.Value.Sex);
            foreach (var i in root)
            {
                RecursivePrint(i, ++level);
                level--;
            }
        }
    }


    public class Person
    {
        public string Name { set; get; }
        public bool? Sex { set; get; } //Толерантный пол =)
    }

    public class TreeElement<T> : IEnumerable<TreeElement<T>>
    {
        private T _value;
        public bool HasValue { set; get; }

        public T Value
        {
            set
            {
                _value = value;
               HasValue = _value != null;
            }
            get { return _value; }
        }

        public TreeElement()
        {
            Children = new List<TreeElement<T>>();
        }

        public TreeElement(T value)
        {
            Children = new List<TreeElement<T>>();
            Value = value;
        }
        public List<TreeElement<T>> Children { set; get; }
        public IEnumerator<TreeElement<T>> GetEnumerator()
        {
            return Children.GetEnumerator();
        }
        public TreeElement<T> this[int index]
        {
            get
            {
                return Children[index];
            }
        }
        IEnumerator IEnumerable.GetEnumerator()
        {
            return GetEnumerator();
        }
    }
}