Mdi Forms In C#

Mdi Forms In C#

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Drawing.Drawing2D;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace mdi_prg1

{

    public partial class Form1 : Form

    {

        private int childFormNumber = 0;

        public Form1()

        {

            InitializeComponent();

        }

        private void newToolStripMenuItem_Click(object sender, EventArgs e)

        {          

         Form2 f2 = new Form2();

         f2.MdiParent = this;

         f2.Text = "Window Form Number:" + childFormNumber++;

         this.FormBorderStyle = FormBorderStyle.Fixed3D;

         f2.Show();

        }

        private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)

        {

      

        }

        private void openToolStripMenuItem_Click(object sender, EventArgs e)

        {

            OpenFileDialog ofdlg = new OpenFileDialog();

                       

            ofdlg.Title = "Open Text Files";

            ofdlg.Filter = "txt files (*.txt)|*.txt|All files (*.*)|*.*";

            ofdlg.FilterIndex = 2;

           

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

            {

                richTextBox1.SelectionFont = new Font("Verdana", 12, FontStyle.Bold);

                richTextBox1.SelectionColor = Color.Red;

                richTextBox1.LoadFile(ofdlg.FileName, RichTextBoxStreamType.PlainText);

                this.Text = ofdlg.FileName.ToString();

            }

        }

        private void closeToolStripMenuItem_Click(object sender, EventArgs e)

        {

            this.Close();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            this.Invalidate();

        }

        private void minimizeToolStripMenuItem_Click(object sender, EventArgs e)

        {

         

        }

        private void exitToolStripMenuItem_Click(object sender, EventArgs e)

        {

            Application.Exit();

        }

        private void Form1_Paint(object sender, PaintEventArgs e)

        {

            Rectangle BaseRectangle =

                new Rectangle(0, 0, this.Width - 1, this.Height - 1);

            Brush Gradient_Brush = new LinearGradientBrush(BaseRectangle, Color.Navy, Color.LightSlateGray,

                LinearGradientMode.Vertical);

            e.Graphics.FillRectangle(Gradient_Brush, BaseRectangle);

        }

    }

}