Binary file creation

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 binaryfile : Form

    {

        public binaryfile()

        {

            InitializeComponent();

        }

        BinaryWriter bw;

        FileStream fs;

        BinaryReader br;

        private void button1_Click(object sender, EventArgs e)

        {

           

            fs = new FileStream(@"E:\demo.data", FileMode.Create);

            bw = new BinaryWriter(fs);

            for (int i = 0; i < 5; i++)

            {

                bw.Write(i);

               

            }

            bw.Close();

            MessageBox.Show("Binary file created successfully");

        }

        private void button2_Click(object sender, EventArgs e)

        {

            fs = new FileStream(@"E:\demo.data", FileMode.Open);

            br = new BinaryReader(fs);

            int l = (int)fs.Length;

            for (int i = 0; i < l / 4; i++)

            {

                listBox1.Items.Add(br.ReadInt32());

            }

        }

    }

}