ue6_3

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;

namespace WindowsFormsApplication5
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            button1.Visible = false;
        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Application.Exit();
        }

        private void visibleToolStripMenuItem_Click(object sender, EventArgs e)
        {
            button1.Visible = true;
        }

        private void invisibleToolStripMenuItem_Click(object sender, EventArgs e)
        {
            button1.Visible = false;
        }

        private void button1_VisibleChanged(object sender, EventArgs e)
        {
            if (button1.Visible)
            {
                invisibleToolStripMenuItem.Visible = true;
                visibleToolStripMenuItem.Visible = false;
            }
            else
            {
                invisibleToolStripMenuItem.Visible = false;
                visibleToolStripMenuItem.Visible = true;
            }
        }
    }
}