how to display outputs from i/o using listbox using c#

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 WindowsFormsApplication2
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        private void Form3_Load(object sender, EventArgs e)
        {
            string line;
            System.IO.StreamReader file = 
            new System.IO.StreamReader(@"C:\Project Files\MyTestFile.txt");
            while ((line = file.ReadLine()) != null)
            {
                listBox1.Items.Add(line);
            }

            file.Close();
        }
    }
}