using System.Linq;
using System.Windows.Forms;
namespace WindowsFormsApplication1 {
    public partial class Form3 : Form {
        public Form3() {
            InitializeComponent();

            var c = new[] {
                new { Code = 1, Name = "Tanaka" , Age = 18 },
                new { Code = 2, Name = "Suzuki" , Age = 32 },
                new { Code = 3, Name = "Sato"   , Age = 19 },
                new { Code = 4, Name = "Yamada" , Age = 12 },
                new { Code = 5, Name = "Aoyama" , Age = 21 }
            };

            var q = 
                from x in c 
                where x.Age < 20
                orderby x.Name
                select new { Code = x.Code, Name = x.Name };

            listBox.DataSource = q.ToArray();
            listBox.ValueMember = "Code";
            listBox.DisplayMember = "Name";
            listBox.SelectedValueChanged += (sender, e) => {
                this.Value = listBox.SelectedValue;
                MessageBox.Show(this.Value.ToString()); };
        }

        public object Value { get; private set; }
    }
}

using System;
using System.Collections.Generic;
using System.Windows.Forms;
namespace WindowsFormsApplication1 {
    public partial class Form2 : Form {
        public Form2() {
            InitializeComponent();

            Member tanaka = new Member();
            tanaka.Code = 1;
            tanaka.Name = "Tanaka";
            tanaka.Age = 18;

            Member suzuki = new Member();
            suzuki.Code = 2;
            suzuki.Name = "Suzuki";
            suzuki.Age = 32;

            Member sato = new Member();
            sato.Code = 3;
            sato.Name = "Sato";
            sato.Age = 19;

            Member yamada = new Member();
            yamada.Code = 4;
            yamada.Name = "Yamada";
            yamada.Age = 12;

            Member aoyama = new Member();
            aoyama.Code = 5;
            aoyama.Name = "Aoyama";
            aoyama.Age = 21;

            Member[] c = new Member[] {
                tanaka, suzuki, sato, yamada, aoyama };

            List<Item> list = new List<Item>();
            foreach (Member x in c) {
                if (x.Age < 20) {
                    Item item = new Item();
                    item.Code = x.Code;
                    item.Name = x.Name;
                    list.Add(item);
                }
            }
            list.Sort(
                delegate(Item a, Item b) {
                    return string.Compare(a.Name, b.Name); });

            listBox.DataSource = list;
            listBox.ValueMember = "Code";
            listBox.DisplayMember = "Name";

            listBox.SelectedValueChanged += 
                delegate(object sender, EventArgs e) {
                    this.Value = this.listBox.SelectedValue;
                    MessageBox.Show(this.Value.ToString()); };
        }

        private object _Value;
        public object Value {
            get { return this._Value; }
            private set { this._Value = value; }
        }
    }

    public class Item {
        private int _Code;
        public int Code {
            get { return this._Code; }
            set { this._Code = value; }
        }

        private string _Name;
        public string Name {
            get { return this._Name; }
            set { this._Name = value; }
        }
    }

    public class Member {
        private int _Code;
        public int Code {
            get { return this._Code; }
            set { this._Code = value; }
        }

        private string _Name;
        public string Name {
            get { return this._Name; }
            set { this._Name = value; }
        }

        private int _Age;
        public int Age { 
            get { return this._Age; }
            set { this._Age = value; }
        }
    }
}