using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
 
namespace WindowsApplication1
{
    public partial class Form2 : Form
    {
        //****************************
        internal Form1 form1;
        //****************************
 
        public Form2()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            Form3 frm = new Form3();
            frm.MdiParent = form1;
            this.Hide();
            frm.Show();
        }
 
        private void button2_Click(object sender, EventArgs e)
        {
            form1.label1.Visible = !form1.label1.Visible;
        }
    }
}