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        private void button1_Click(object sender, EventArgs e)

        {

            if (form2.Visible) form2.Close(); else form2.Show();

        }

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

namespace WindowsFormsApplication1

{

    public partial class Form2 : Form

    {

        private int count;

        public Form2()

        {

            InitializeComponent();

        }

        private void Form2_FormClosing(object sender, FormClosingEventArgs e)

        {

            if (e.CloseReason == CloseReason.UserClosing)

            {

                e.Cancel = true;

                if (MessageBox.Show("������� ����������� ����?", "�������������",

                    MessageBoxButtons.YesNo, MessageBoxIcon.Question) == DialogResult.Yes)

                {

                    Hide();

                    Owner.Activate();

                }

            }

        }

        private void Form2_VisibleChanged(object sender, EventArgs e)

        {

            Owner.Controls["button1"].Text=Visible ? "������� ����������� ����" : "������� ����������� ����";

            if (Visible) label1.Text = "���� ������� � " + (++count) + " ���";

        }

    }

}

        internal void button2_Click(object sender, EventArgs e)

        {

            Owner.Text = textBox1.Text;

            Owner.OwnedForms[0].Text = textBox2.Text;

        }

        private void Form3_VisibleChanged(object sender, EventArgs e)

        {

            if (Visible) ActiveControl = textBox1;

        }

        private void button2_Click(object sender, EventArgs e)

        {

            if (form3.ShowDialog() == DialogResult.OK)

            {

                form3.button2_Click(this, EventArgs.Empty);

            }

        }