how to dock button so that it can adjust with the form

using System;
using System.Drawing;
using System.Windows.Forms;

public partial class FormMain : Form {
    
    public FormMain() {
        InitializeComponent();
        Setup();
    } //FormMain

    void Setup() {
        Panel left = new Panel();
        this.Padding = new Padding(10);
        left.BackColor = Color.Yellow;
        left.Dock = DockStyle.Left;
        Panel right = new Panel();
        right.BackColor = Color.Wheat;
        right.Dock = DockStyle.Fill;
        right.Padding = new Padding(4);
        Button button = new Button();
        button.Dock = DockStyle.Bottom;
        button.Text = "&Click it!";
        button.Click += delegate(object sender, EventArgs eventArgs) {
            MessageBox.Show("Clicked!");
        };
        button.BackColor = Color.LightGray;
        ListBox lb = new ListBox();
        lb.Dock = DockStyle.Fill;
        right.Controls.AddRange(new Control[] { lb, button, });
        this.Controls.Add(right);
        this.Controls.Add(left);
    } //Setup

    [STAThread]
    static void Main() {
        Application.EnableVisualStyles();
        Application.SetCompatibleTextRenderingDefault(false);
        Application.Run(new FormMain());
    } //Main (entry point)

} //class FormMain