list

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 WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            List<int> mylist = new List<int>();
            mylist.Add(99);
            mylist.Add(990);
            mylist.Add(999);
            mylist.Add(991);

            MessageBox.Show(mylist[3].ToString());

 }
    }
}