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;
namespace Wrox.WindowGUIProgramming.Chapter5
{
    /// 
    /// Summary description for Form1.
    /// 

    public class frmMouseButtons : System.Windows.Forms.Form
    {
        private System.Windows.Forms.Label lblLeftClick;
        private System.Windows.Forms.Label lblRightClick;
        private System.Windows.Forms.Label lblMiddleClick;
        private System.Windows.Forms.Label lblHover;
        /// 
        /// Required designer variable.
        /// 

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

        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }
        protected override void OnMouseDown(MouseEventArgs e)
        {
            switch(e.Button)
            {
                case(MouseButtons.Left):
                    lblLeftClick.Text = "Left Click";
                    break;
                case(MouseButtons.Middle):
                    lblLeftClick.Text = "Middle Click";
                    break;
                case(MouseButtons.Right):
                    lblLeftClick.Text = "Right Click";
                    break;
                case(MouseButtons.XButton1):
                    lblLeftClick.Text = "XButton1 Click";
                    break;
                case(MouseButtons.XButton2):
                    lblLeftClick.Text = "XButton2 Click";
                    break;
            }
            switch(e.Clicks)
            {
                case 1:
                    lblMiddleClick.Text = "Single Click";
                    break;
                case 2:
                    lblMiddleClick.Text = "Double Click!";
                    break;
                default:
                    lblMiddleClick.Text = "Many clicks!";
                    break;
            }
        }
        protected override void OnMouseWheel(MouseEventArgs e)
        {
            switch(e.Delta)
            {
                case -360:
                    lblRightClick.Text = "One Rotation Reverse";
                    break;
                case -720:
                    lblRightClick.Text = "Two Rotations Reverse";
                    break;
                case 360:
                    lblRightClick.Text = "One Rotation Forward";
                    break;
                case 720:
                    lblRightClick.Text = "Two Rotations Forward";
                    break;
                default:
                    lblRightClick.Text = "Rotation wasn't full turn of wheel";
                    break;
            }
        }
    
        #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.lblLeftClick = new System.Windows.Forms.Label();
            this.lblRightClick = new System.Windows.Forms.Label();
            this.lblMiddleClick = new System.Windows.Forms.Label();
            this.lblHover = new System.Windows.Forms.Label();
            this.SuspendLayout();
            // 
            // lblLeftClick
            // 
            this.lblLeftClick.Location = new System.Drawing.Point(8, 8);
            this.lblLeftClick.Name = "lblLeftClick";
            this.lblLeftClick.TabIndex = 0;
            // 
            // lblRightClick
            // 
            this.lblRightClick.Location = new System.Drawing.Point(8, 32);
            this.lblRightClick.Name = "lblRightClick";
            this.lblRightClick.Size = new System.Drawing.Size(100, 32);
            this.lblRightClick.TabIndex = 1;
            // 
            // lblMiddleClick
            // 
            this.lblMiddleClick.Location = new System.Drawing.Point(8, 72);
            this.lblMiddleClick.Name = "lblMiddleClick";
            this.lblMiddleClick.TabIndex = 2;
            // 
            // lblHover
            // 
            this.lblHover.Location = new System.Drawing.Point(8, 104);
            this.lblHover.Name = "lblHover";
            this.lblHover.TabIndex = 3;
            this.lblHover.MouseEnter += new System.EventHandler(this.lblHover_MouseEnter);
            this.lblHover.MouseHover += new System.EventHandler(this.lblHover_MouseHover);
            this.lblHover.MouseLeave += new System.EventHandler(this.lblHover_MouseLeave);
            // 
            // frmMouseButtons
            // 
            this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
            this.ClientSize = new System.Drawing.Size(184, 198);
            this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                          this.lblHover,
                                                                          this.lblMiddleClick,
                                                                          this.lblRightClick,
                                                                          this.lblLeftClick});
            this.MaximizeBox = false;
            this.Name = "frmMouseButtons";
            this.Text = "MouseButtons";
            this.ResumeLayout(false);
        }
        #endregion
        protected void lblHover_MouseEnter(object sender, EventArgs e)
        {
         lblRightClick.Text = "One Rotation Forward";
         lblHover.Text = "Entering label";
            Cursor = Cursors.NoMove2D;
        }
        protected void lblHover_MouseHover(object sender, EventArgs e)
        {
            lblHover.Text = "Hovering over label";
            Cursor = Cursors.Hand;
            System.Diagnostics.Debug.WriteLine("hover");
        }
        protected void lblHover_MouseLeave(object sender, EventArgs e)
        {
            lblHover.Text = "Leaving label";
            Cursor = Cursors.Default;
        }
        /// 
        /// The main entry point for the application.
        /// 

        [STAThread]
        static void Main() 
        {
            Application.Run(new frmMouseButtons());
        }
    }
}