C# - imprimindo um Array de inteiros num ListBox

Imprimindo um array de inteiros num ListBox

//IMPRIMINDO ARRAY EM LISTBOX

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using System.Threading;

namespace keypress {

    public partial class Form1 : Form {

        private System.Windows.Forms.ListBox listBox;

        int i = 0;

        int [ ] arr = new int [ 100 ];

        /*============================================================*/

        public void List_Box ( ) {

            listBox.Location = new Point ( 250, 100 );

            //Propriedades de fonte no listBox

            listBox.Font = new Font ( "Times New Roman", 15F,

             System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, 0 );

            //Colororindo a font do listBox com rgb

            listBox.ForeColor = Color.FromArgb ( 255, 0, 255 );

        }

        /*============================================================*/

        public void Ini_Array ( ) {

            listBox = new System.Windows.Forms.ListBox ( );

            for ( i = 0; i < arr.Length; i++ ) {

                arr [ i ] = i;

                listBox.Items.Add ( arr [ i ] );

            }

        }

        /*============================================================*/

        protected override void OnPaint ( PaintEventArgs e ) {

            this.Size = new System.Drawing.Size ( 600, 300 );

            this.Text = "IMPRIMINDO ARRAY EM LISTBOX";

            this.BackColor = Color.LightBlue;

            Graphics dc = e.Graphics;

            Pen BluePen = new Pen ( Color.Green, 10 );

            dc.DrawRectangle ( BluePen, 5, 5, 575, 250 );

            Font myFont = new System.Drawing.Font ( "Helvetica", 14,

                FontStyle.Italic );

            Brush myBrush = new SolidBrush ( System.Drawing.Color.Black );

            Brush myBrush_1 = new SolidBrush ( System.Drawing.Color.Red );

            dc.DrawString ( "IMPRIMINDO ARRAY EM LISTBOX",

                myFont, myBrush_1, 140, 15 );

            dc.DrawString ( "Abaixo o array de inteiros ",

             myFont, myBrush, 190, 40 );

        }

        /*============================================================*/

        public Form1 ( ) {

            Ini_Array ( );

            List_Box ( );

            this.Controls.Add ( this.listBox );

        }

    }

    /*============================================================*/

    static class Program {

        /// <summary>

        /// The main entry point for the application.

        /// </summary>

        [STAThread]

        static void Main ( ) {

            Application.EnableVisualStyles ( );

            Application.SetCompatibleTextRenderingDefault ( false );

            Application.Run ( new Form1 ( ) );

        }

    }

}