C# 事件与委托___窗口间的相互开启与关闭

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 事件与委托___窗口间的相互开启与关闭
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void toolStripMenuItem1_Click(object sender, EventArgs e)
        {
            Form2 form2 = new Form2();
            form2.Show();
            form2.FormClosed += new FormClosedEventHandler(form1_FormClosed);
        }
        void form1_FormClosed(object sender, FormClosedEventArgs e)
        {
            关闭窗口button1.Visible = false;
        }
       
    }
}