Event C#

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow
Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Text;
namespace Wrox.ProgrammingWindowsGUI.Chapter5
{
    /// 
    /// Summary description for Form1.
    /// 

    public class MouseMovement : System.Windows.Forms.Form
    {
        private System.Windows.Forms.TextBox txtMouseInfo;
        private System.Windows.Forms.Button btTrackMouseOn;
        private System.Windows.Forms.Button btTrackMouseOff;
        private bool toggleMouse = false;
        private Timer tCheckMouse = new Timer();
        private System.Windows.Forms.Button btScreenTrack;
        /// 
        /// Required designer variable.
        /// 

        private System.ComponentModel.Container components = null;
        public MouseMovement()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();
            //
            // TODO: Add any constructor code after InitializeComponent call
            //
            txtMouseInfo.Text = GetMouseInfo().ToString();
        }
        /// 
        /// Clean up any resources being used.
        /// 

        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        #region Windows Form Designer generated code
        /// 
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// 

        private void InitializeComponent()
        {
         this.txtMouseInfo = new System.Windows.Forms.TextBox();
         this.btTrackMouseOn = new System.Windows.Forms.Button();
         this.btTrackMouseOff = new System.Windows.Forms.Button();
         this.btScreenTrack = new System.Windows.Forms.Button();
         this.SuspendLayout();
         // 
         // txtMouseInfo
         // 
         this.txtMouseInfo.Multiline = true;
         this.txtMouseInfo.Name = "txtMouseInfo";
         this.txtMouseInfo.ReadOnly = true;
         this.txtMouseInfo.Size = new System.Drawing.Size(432, 320);
         this.txtMouseInfo.TabIndex = 0;
         this.txtMouseInfo.Text = "";
         this.txtMouseInfo.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Control_MouseMove);
         // 
         // btTrackMouseOn
         // 
         this.btTrackMouseOn.Location = new System.Drawing.Point(16, 328);
         this.btTrackMouseOn.Name = "btTrackMouseOn";
         this.btTrackMouseOn.Size = new System.Drawing.Size(192, 23);
         this.btTrackMouseOn.TabIndex = 1;
         this.btTrackMouseOn.Text = "Start Track Mouse";
         this.btTrackMouseOn.Click += new System.EventHandler(this.btTrackMouseOn_Click);
         this.btTrackMouseOn.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Control_MouseMove);
         // 
         // btTrackMouseOff
         // 
         this.btTrackMouseOff.Location = new System.Drawing.Point(232, 328);
         this.btTrackMouseOff.Name = "btTrackMouseOff";
         this.btTrackMouseOff.Size = new System.Drawing.Size(184, 23);
         this.btTrackMouseOff.TabIndex = 2;
         this.btTrackMouseOff.Text = "Stop Track Mouse";
         this.btTrackMouseOff.Click += new System.EventHandler(this.btTrackMouseOff_Click_1);
         this.btTrackMouseOff.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Control_MouseMove);
         // 
         // btScreenTrack
         // 
         this.btScreenTrack.Location = new System.Drawing.Point(16, 360);
         this.btScreenTrack.Name = "btScreenTrack";
         this.btScreenTrack.Size = new System.Drawing.Size(400, 23);
         this.btScreenTrack.TabIndex = 3;
         this.btScreenTrack.Text = "Start Screen wide mouse tracking";
         this.btScreenTrack.Click += new System.EventHandler(this.btScreenTrack_Click);
         // 
         // MouseMovement
         // 
         tCheckMouse.Tick += new EventHandler(Timer_Check);
         tCheckMouse.Enabled = true;
         tCheckMouse.Stop();
         
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(432, 390);
         this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                      this.btScreenTrack,
                                                                      this.btTrackMouseOff,
                                                                      this.btTrackMouseOn,
                                                                      this.txtMouseInfo});
         this.MaximizeBox = false;
         this.Name = "MouseMovement";
         this.Text = "Mouse Movement";
         this.ResumeLayout(false);
      }
        #endregion
        /// 
        /// The main entry point for the application.
        /// 

        [STAThread]
        static void Main() 
        {
            Application.Run(new MouseMovement());
        }
        private StringBuilder GetMouseInfo()
        {
            StringBuilder sb = new StringBuilder();
            sb.Append("Mouse Present: "+SystemInformation.MousePresent+"\r\n");
            sb.Append("Number of Mouse Buttons: "+SystemInformation.MouseButtons+"\r\n");
            sb.Append("Mouse Wheel Present: "+SystemInformation.MouseWheelPresent+"\r\n");
            sb.Append("Number of Mouse Wheel scroll lines: "+SystemInformation.MouseWheelScrollLines+"\r\n");
            sb.Append("Native wheel support: "+SystemInformation.NativeMouseWheelSupport+"\r\n");
            sb.Append("Mouse buttons swapped: "+SystemInformation.MouseButtonsSwapped+"\r\n");
            return sb;
        }
        private void btTrackMouseOn_Click(object sender, System.EventArgs e)
        {
            toggleMouse = true;
            tCheckMouse.Stop();
        }
        protected override void OnMouseMove(MouseEventArgs e)
        {
            CheckMousePosition(e, null);
        }
        protected void Control_MouseMove(object sender, MouseEventArgs e)
        {
            CheckMousePosition(e, sender);
        }
        private void CheckMousePosition(MouseEventArgs e, object control)
        {
            if(control==null)
            {
                if(toggleMouse) txtMouseInfo.Text = "x: "+e.X+", y:"+e.Y;
            }
            else
            {
                int left = e.X+((Control)control).Left;
                int top = e.Y+((Control)control).Top;
                if(toggleMouse) txtMouseInfo.Text = "x: "+left+", y:"+top;
            }
        }
        private void btTrackMouseOff_Click(object sender, System.EventArgs e)
        {
            toggleMouse = false;
            txtMouseInfo.Text = GetMouseInfo().ToString();
        }
        private void Timer_Check(object sender, EventArgs e)
        {
         Point pMousePosition = Control.MousePosition;
            txtMouseInfo.Text = "x: "+pMousePosition.X+", y:"+pMousePosition.Y;
        }
        private void btScreenTrack_Click(object sender, System.EventArgs e)
        {
            toggleMouse = false;
            tCheckMouse.Start();
        }
        private void btTrackMouseOff_Click_1(object sender, System.EventArgs e)
        {
            toggleMouse = false;
            txtMouseInfo.Text = GetMouseInfo().ToString();
        }
    }
}