C# LINQ COLECCIONES

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace LINQ_TEST
{
    public partial class Form1 : Form
    {
        public class Persona
        {
            public string _name;
            public int _edad;

            public Persona(string name, int edad) 
            {
                _name = name;
                _edad = edad;
            
            }
        }

        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            List<Persona> pers = new List<Persona>();

            pers.Add(new Persona("Ricardo",23));
            pers.Add(new Persona("aldo", 24));
            pers.Add(new Persona("cristan", 26));
            pers.Add(new Persona("bola", 26));
            pers.Add(new Persona("joao", 19));
            //Persona p = new Persona("Ricardo", 23);

            var res = from p in pers
                      where p._edad <= 24 
                      orderby p._edad ascending
                      select p;

            string names = "";
            foreach (var item in res)
            {
                names += item._name + item._edad + " ";
            }
            //"joao19 Ricardo23 aldo24 "
        }
    }
}