C#.NET Program 17

Output:

Code:

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 Question_7

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        int m_child = 0;

        Form ChildForm;

        private void newToolStripMenuItem_Click(object sender, EventArgs e)

        {

            ChildForm = new Form();

            ChildForm.MdiParent = this;

            m_child += 1;

            ChildForm.Text = "Window" + m_child;

            ChildForm.Show();

        }

        

        private void closeToolStripMenuItem_Click(object sender, EventArgs e)

        {

            ActiveMdiChild.Close();

        }

        private void closeAllToolStripMenuItem_Click(object sender, EventArgs e)

        {

            foreach(Form ChildForm in this.MdiChildren)

            {

                ChildForm.Close();

            }

        }

        private void minimizeToolStripMenuItem_Click(object sender, EventArgs e)

        {

            ChildForm.WindowState = FormWindowState.Minimized;

        }

        private void maximizeToolStripMenuItem_Click(object sender, EventArgs e)

        {

            ChildForm.WindowState = FormWindowState.Maximized;

        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)

        {

            Application.Exit();

        }

        private void horizontalToolStripMenuItem_Click(object sender, EventArgs e)

        {

            this.LayoutMdi(MdiLayout.TileHorizontal);

        }

        private void varticalToolStripMenuItem_Click(object sender, EventArgs e)

        {

            this.LayoutMdi(MdiLayout.TileVertical);

        }

        private void cascadeToolStripMenuItem_Click(object sender, EventArgs e)

        {

            this.LayoutMdi(MdiLayout.Cascade);

        }

    }

}