GUI Windows Forms C# Tutorial

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
public partial class ChildForm : Form
{
    public ChildForm()
    {
        InitializeComponent();
    }
    private void settoRedToolStripMenuItem_Click(object sender, EventArgs e)
    {
        this.BackColor = Color.Red;
    }
    private void settoBlueToolStripMenuItem_Click(object sender, EventArgs e)
    {
        this.BackColor = Color.Blue;
    }
    private void settoGreenToolStripMenuItem_Click(object sender, EventArgs e)
    {
        this.BackColor = Color.Green;
    }
    public void Save()
    {
        MessageBox.Show("I have saved my data!");
    }
}
partial class ChildForm
{
    private void InitializeComponent()
    {
        this.menuStrip1 = new System.Windows.Forms.MenuStrip();
        this.specialToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.settoRedToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.settoBlueToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.settoGreenToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.menuStrip1.SuspendLayout();
        this.SuspendLayout();
        // 
        // menuStrip1
        // 
        this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
        this.specialToolStripMenuItem});
        this.menuStrip1.Location = new System.Drawing.Point(0, 0);
        this.menuStrip1.Name = "menuStrip1";
        this.menuStrip1.Size = new System.Drawing.Size(534, 24);
        this.menuStrip1.TabIndex = 0;
        this.menuStrip1.Text = "menuStrip1";
        // 
        // specialToolStripMenuItem
        // 
        this.specialToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
        this.settoRedToolStripMenuItem,
        this.settoBlueToolStripMenuItem,
        this.settoGreenToolStripMenuItem});
        this.specialToolStripMenuItem.Name = "specialToolStripMenuItem";
        this.specialToolStripMenuItem.Text = "&Special";
        // 
        // settoRedToolStripMenuItem
        // 
        this.settoRedToolStripMenuItem.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.settoRedToolStripMenuItem.Name = "settoRedToolStripMenuItem";
        this.settoRedToolStripMenuItem.Text = "Set to Red";
        this.settoRedToolStripMenuItem.Click += new System.EventHandler(this.settoRedToolStripMenuItem_Click);
        // 
        // settoBlueToolStripMenuItem
        // 
        this.settoBlueToolStripMenuItem.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.settoBlueToolStripMenuItem.Name = "settoBlueToolStripMenuItem";
        this.settoBlueToolStripMenuItem.Text = "Set to Blue";
        this.settoBlueToolStripMenuItem.Click += new System.EventHandler(this.settoBlueToolStripMenuItem_Click);
        // 
        // settoGreenToolStripMenuItem
        // 
        this.settoGreenToolStripMenuItem.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.settoGreenToolStripMenuItem.Name = "settoGreenToolStripMenuItem";
        this.settoGreenToolStripMenuItem.Text = "Set to Green";
        this.settoGreenToolStripMenuItem.Click += new System.EventHandler(this.settoGreenToolStripMenuItem_Click);
        // 
        // ChildForm
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(534, 541);
        this.Controls.Add(this.menuStrip1);
        this.MainMenuStrip = this.menuStrip1;
        this.Name = "ChildForm";
        this.Text = "ChildForm";
        this.menuStrip1.ResumeLayout(false);
        this.ResumeLayout(false);
        this.PerformLayout();
    }
    private System.Windows.Forms.MenuStrip menuStrip1;
    private System.Windows.Forms.ToolStripMenuItem specialToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem settoRedToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem settoBlueToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem settoGreenToolStripMenuItem;
}
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    private void newToolStripMenuItem_Click(object sender, EventArgs e)
    {
        ChildForm child = new ChildForm();
        child.MdiParent = this;
        child.Show();
    }
    private void saveToolStripMenuItem_Click(object sender, EventArgs e)
    {
        ChildForm formToSave = (ChildForm)this.ActiveMdiChild;
        formToSave.Save();
    }
    private void fileToolStripMenuItem_DropDownOpening(object sender, EventArgs e)
    {
        if (this.MdiChildren.Length == 0)
            saveToolStripMenuItem.Enabled = false;
        else
            saveToolStripMenuItem.Enabled = true;
    }
}
partial class Form1
{
    private void InitializeComponent()
    {
        this.menuStrip1 = new System.Windows.Forms.MenuStrip();
        this.fileToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.toolStripSeparator1 = new System.Windows.Forms.ToolStripSeparator();
        this.newToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.saveToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.exitToolStripMenuItem = new System.Windows.Forms.ToolStripMenuItem();
        this.menuStrip1.SuspendLayout();
        this.SuspendLayout();
        // 
        // menuStrip1
        // 
        this.menuStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
        this.fileToolStripMenuItem});
        this.menuStrip1.Location = new System.Drawing.Point(0, 0);
        this.menuStrip1.Name = "menuStrip1";
        this.menuStrip1.Size = new System.Drawing.Size(576, 24);
        this.menuStrip1.TabIndex = 0;
        this.menuStrip1.Text = "menuStrip1";
        // 
        // fileToolStripMenuItem
        // 
        this.fileToolStripMenuItem.DropDownItems.AddRange(new System.Windows.Forms.ToolStripItem[] {
        this.newToolStripMenuItem,
        this.saveToolStripMenuItem,
        this.toolStripSeparator1,
        this.exitToolStripMenuItem});
        this.fileToolStripMenuItem.Name = "fileToolStripMenuItem";
        this.fileToolStripMenuItem.Text = "&File";
        this.fileToolStripMenuItem.DropDownOpening += new System.EventHandler(this.fileToolStripMenuItem_DropDownOpening);
        // 
        // toolStripSeparator1
        // 
        this.toolStripSeparator1.Name = "toolStripSeparator1";
        // 
        // newToolStripMenuItem
        // 
        this.newToolStripMenuItem.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.newToolStripMenuItem.Name = "newToolStripMenuItem";
        this.newToolStripMenuItem.Text = "&New";
        this.newToolStripMenuItem.Click += new System.EventHandler(this.newToolStripMenuItem_Click);
        // 
        // saveToolStripMenuItem
        // 
        this.saveToolStripMenuItem.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.saveToolStripMenuItem.Name = "saveToolStripMenuItem";
        this.saveToolStripMenuItem.Text = "&Save";
        this.saveToolStripMenuItem.Click += new System.EventHandler(this.saveToolStripMenuItem_Click);
        // 
        // exitToolStripMenuItem
        // 
        this.exitToolStripMenuItem.ImageTransparentColor = System.Drawing.Color.Magenta;
        this.exitToolStripMenuItem.Name = "exitToolStripMenuItem";
        this.exitToolStripMenuItem.Text = "E&xit";
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(576, 438);
        this.Controls.Add(this.menuStrip1);
        this.IsMdiContainer = true;
        this.MainMenuStrip = this.menuStrip1;
        this.Name = "Form1";
        this.Text = "Form1";
        this.menuStrip1.ResumeLayout(false);
        this.ResumeLayout(false);
        this.PerformLayout();
    }
    private System.Windows.Forms.MenuStrip menuStrip1;
    private System.Windows.Forms.ToolStripMenuItem fileToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem saveToolStripMenuItem;
    private System.Windows.Forms.ToolStripSeparator toolStripSeparator1;
    private System.Windows.Forms.ToolStripMenuItem exitToolStripMenuItem;
    private System.Windows.Forms.ToolStripMenuItem newToolStripMenuItem;
}
public class ChildFormBackGround
{
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new Form1());
    }
}