C# monthCalendarで週の番号を表示する

monthCalendar1.ShowWeekNumbers = True / False;

using System;
using System.Windows.Forms;

namespace FormTestApp
{
    public partial class Form1 : Form
    {

        public Form1()
        {
            InitializeComponent();

        }
        
        private void button1_Click(object sender, EventArgs e)
        {
            // 週(1～52)を表示する
            monthCalendar1.ShowWeekNumbers = !monthCalendar1.ShowWeekNumbers;
        }
    }
}