Random lottery number generator.

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];

            //counter variable to use in the loop
            int index = 0;

            //declare a streamreader variable.
            StreamReader inputFile;

            //open the file and get a streamreader object.
            while (index < randomNumbers.Length && !inputFile.EndOfStream) ;
            {
                randomNumbers[index] = int.Parse(inputFile.ReadLine());
                index++;
            }

            //close the file.
            inputFile.Close();

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

            //write the arrays contents to the file
            foreach (int value in randomNumbers)
               


                {
                    outputlistbox1.items.add(value);
                }
        }
       catch (Exception ex) 
    {
       //dislpay an error message.
        MessageBox.Show(ex.message);

updated