GUI Windows Forms C# Tutorial

using System;
using System.Windows.Forms;
public class ListBoxItemVisibleFormDemo{
    [STAThread]
    public static void Main(string[] args)
    {
        Application.Run(new ListBoxItemVisibleForm());
    }
}
public partial class ListBoxItemVisibleForm : Form
{
    private int counter = 0;
    
    public ListBoxItemVisibleForm()
    {
        InitializeComponent();
    }
    private void cmdTest_Click(object sender, EventArgs e)
    {
        for (int i = 0; i < 200; i++)
        {
            counter++;
            listBox1.Items.Add("Item " + counter.ToString());
        }
        listBox1.TopIndex = listBox1.Items.Count - 1;
        listBox1.SelectedIndex = listBox1.Items.Count - 1;
    }
}
partial class ListBoxItemVisibleForm
{
    private System.Windows.Forms.ListBox listBox1;
    private System.Windows.Forms.Button cmdTest;
    private System.ComponentModel.IContainer components = null;
    protected override void Dispose(bool disposing)
    {
        if (disposing && (components != null))
        {
            components.Dispose();
        }
        base.Dispose(disposing);
    }
    private void InitializeComponent()
    {
        this.listBox1 = new System.Windows.Forms.ListBox();
        this.cmdTest = new System.Windows.Forms.Button();
        this.SuspendLayout();
        this.listBox1.FormattingEnabled = true;
        this.listBox1.Location = new System.Drawing.Point(8, 8);
        this.listBox1.Name = "listBox1";
        this.listBox1.Size = new System.Drawing.Size(248, 160);
        this.listBox1.TabIndex = 0;
        this.cmdTest.Location = new System.Drawing.Point(12, 184);
        this.cmdTest.Name = "cmdTest";
        this.cmdTest.Size = new System.Drawing.Size(132, 28);
        this.cmdTest.TabIndex = 1;
        this.cmdTest.Text = "Test Scroll";
        this.cmdTest.Click += new System.EventHandler(this.cmdTest_Click);
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(292, 246);
        this.Controls.Add(this.cmdTest);
        this.Controls.Add(this.listBox1);
        this.Name = "ListBoxItemVisibleForm";
        this.Text = "ListBoxItemVisibleForm";
        this.ResumeLayout(false);
    }
}