Random lottery number generator.

sorry this is the actual code and im using 2 listbox's

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;
using System.IO;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            //create array for numbers
            const int NUMBER = 5;
            int[] randomNumbers = new int[NUMBER];

            //declare a streamwriter variable
            StreamWriter outputFile;

            //create the file, get streamwriter object
            outputFile = File.CreateText("Values.txt");

            //create random object
            Random rand = new Random();

            //write the arrays contents to the file
            int index;
            for (index = 0; index < randomNumbers.Length; index++)
            {
                randomNumbers[index] = rand.Next(100);