C#

using System;<br />
using System.Drawing;<br />
using System.Collections;<br />
using System.ComponentModel;<br />
using System.Windows.Forms;<br />
using System.Data;<br />
using mshtml;<br />
<br />
namespace WindowsApplication3<br />
{<br />
	public class Form1 : System.Windows.Forms.Form<br />
	{<br />
		private System.Windows.Forms.Label label3;<br />
		private System.Windows.Forms.Label label1;<br />
<br />
		private bool LeftMouseDown = false;<br />
		private Point MouseDownPos;<br />
		private Rectangle DragRect;<br />
		private ArrayList FinalRects;<br />
		private AxSHDocVw.AxWebBrowser axWebBrowser1;<br />
<br />
		private System.ComponentModel.Container components = null;<br />
<br />
		public Form1()<br />
		{<br />
			InitializeComponent();<br />
<br />
			this.axWebBrowser1.Navigate("http://www.msnbc.com");<br />
<br />
			this.MouseDownPos = new Point( 0,0 );<br />
			this.FinalRects = new ArrayList();<br />
<br />
			this.SetStyle(System.Windows.Forms.ControlStyles.SupportsTransparentBackColor, true);<br />
			this.SetStyle(System.Windows.Forms.ControlStyles.AllPaintingInWmPaint, true);<br />
			this.SetStyle(System.Windows.Forms.ControlStyles.DoubleBuffer, true);<br />
			this.SetStyle(System.Windows.Forms.ControlStyles.UserPaint, true);<br />
		}<br />
<br />
		protected override void Dispose( bool disposing )<br />
		{<br />
			if( disposing )<br />
			{<br />
				if (components != null) <br />
				{<br />
					components.Dispose();<br />
				}<br />
			}<br />
			base.Dispose( disposing );<br />
		}<br />
<br />
		#region Windows Form Designer generated code<br />
		/// <summary><br />
		/// Required method for Designer support - do not modify<br />
		/// the contents of this method with the code editor.<br />
		/// </summary><br />
		private void InitializeComponent()<br />
		{<br />
			System.Resources.ResourceManager resources = new System.Resources.ResourceManager(typeof(Form1));<br />
			this.label3 = new System.Windows.Forms.Label();<br />
			this.label1 = new System.Windows.Forms.Label();<br />
			this.axWebBrowser1 = new AxSHDocVw.AxWebBrowser();<br />
			((System.ComponentModel.ISupportInitialize)(this.axWebBrowser1)).BeginInit();<br />
			this.SuspendLayout();<br />
			// <br />
			// label1<br />
			// <br />
			this.label1.BackColor = System.Drawing.Color.Transparent;<br />
			this.label1.Dock = System.Windows.Forms.DockStyle.Fill;<br />
			this.label1.Location = new System.Drawing.Point(0, 0);<br />
			this.label1.Name = "label1";<br />
			this.label1.Size = new System.Drawing.Size(400, 400);<br />
			this.label1.TabIndex = 1;<br />
			this.label1.Paint += new System.Windows.Forms.PaintEventHandler(this.label1_Paint);<br />
			this.label1.MouseUp += new System.Windows.Forms.MouseEventHandler(this.label1_MouseUp);<br />
			this.label1.MouseMove += new System.Windows.Forms.MouseEventHandler(this.label1_MouseMove);<br />
			this.label1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.label1_MouseDown);<br />
			// <br />
			// label3<br />
			// <br />
			this.label3.BackColor = System.Drawing.Color.Transparent;<br />
			this.label3.Controls.Add(this.label1);<br />
			this.label3.Location = new System.Drawing.Point(188, 32);<br />
			this.label3.Name = "label3";<br />
			this.label3.Size = new System.Drawing.Size(400, 400);<br />
			this.label3.TabIndex = 0;<br />
			this.label3.Paint += new System.Windows.Forms.PaintEventHandler(this.label3_Paint);			<br />
			// <br />
			// axWebBrowser1<br />
			//			<br />
			this.axWebBrowser1.Dock = System.Windows.Forms.DockStyle.Fill;<br />
			this.axWebBrowser1.Enabled = true;<br />
			this.axWebBrowser1.Location = new System.Drawing.Point(0, 0);<br />
			this.axWebBrowser1.OcxState = ((System.Windows.Forms.AxHost.State)(resources.GetObject("axWebBrowser1.OcxState")));<br />
			this.axWebBrowser1.Size = new System.Drawing.Size(819, 476);<br />
			this.axWebBrowser1.Controls.Add(label3);<br />
			this.axWebBrowser1.TabIndex = 1;<br />
			this.axWebBrowser1.Invalidated += new InvalidateEventHandler(axWebBrowser1_Invalidated);<br />
			this.axWebBrowser1.Validated += new EventHandler(axWebBrowser1_Validated);<br />
			// <br />
			// Form1<br />
			// <br />
			this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);<br />
			this.BackColor = System.Drawing.SystemColors.Control;<br />
			this.ClientSize = new System.Drawing.Size(819, 476);<br />
			this.Controls.Add(this.axWebBrowser1);<br />
			this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.FixedToolWindow;<br />
			this.MaximumSize = new System.Drawing.Size(825, 500);<br />
			this.MinimumSize = new System.Drawing.Size(825, 500);<br />
			this.Name = "Form1";<br />
			this.Text = "Form1";<br />
			((System.ComponentModel.ISupportInitialize)(this.axWebBrowser1)).EndInit();<br />
			this.ResumeLayout(false);<br />
<br />
		}<br />
		#endregion<br />
<br />
		[STAThread]<br />
		static void Main() <br />
		{<br />
			Application.Run(new Form1());<br />
		}<br />
<br />
		protected override void OnPaintBackground(PaintEventArgs pevent)<br />
		{<br />
			base.OnPaintBackground(pevent);<br />
		}<br />
<br />
		private void label1_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)<br />
		{<br />
			if( e.Button == MouseButtons.Left )<br />
			{<br />
				Console.WriteLine("Panel2_MouseDown");<br />
				MouseDownPos = new Point(e.X, e.Y);          <br />
				LeftMouseDown = true;<br />
				DragRect = new Rectangle(e.X, e.Y, 0, 0);<br />
				this.label1.Invalidate();<br />
			}		<br />
		}<br />
<br />
		private void label1_MouseMove(object sender, System.Windows.Forms.MouseEventArgs e)<br />
		{<br />
			if( e.Button == MouseButtons.Left )<br />
			{<br />
				Console.WriteLine("Panel2_MouseMove");<br />
				DragRect = CalcDragRect(e.X, e.Y);<br />
				this.label1.Invalidate();<br />
			}		<br />
		}<br />
<br />
		private void label1_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)<br />
		{<br />
			if( LeftMouseDown )<br />
			{<br />
				 Console.WriteLine("Panel2_MouseUp");<br />
				LeftMouseDown = false;<br />
				DragRect = CalcDragRect(e.X, e.Y);			<br />
				this.label1.Invalidate();<br />
				FinalRects.Add(DragRect);<br />
			}<br />
		}<br />
<br />
		private void label1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)<br />
		{<br />
			if( LeftMouseDown )<br />
			{<br />
				Pen pen = new Pen(Color.Blue);<br />
				pen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dash;<br />
				DrawRect(e.Graphics, DragRect, pen);<br />
				pen.Dispose();<br />
			}<br />
		}<br />
<br />
		private void label3_Paint(object sender, System.Windows.Forms.PaintEventArgs e)<br />
		{<br />
			foreach( Rectangle rect in FinalRects )<br />
			{<br />
				DrawRect(e.Graphics, rect, Pens.Red);<br />
			}<br />
		}<br />
<br />
		public void DrawRect(Graphics g, Rectangle rect, Pen pen)<br />
		{<br />
			if (rect.Width == 0 && rect.Height == 0) <br />
			{<br />
				g.DrawLine(pen, rect.X, rect.Y, rect.X, rect.Y + (float)0.01);<br />
			}<br />
			else if (rect.Width > 0 && rect.Height == 0) <br />
			{<br />
				g.DrawLine(pen, rect.X, rect.Y, rect.Right, rect.Y);<br />
			}<br />
			else if (rect.Width == 0 && rect.Height > 0) <br />
			{<br />
				g.DrawLine(pen, rect.X, rect.Y, rect.X, rect.Bottom);<br />
			}<br />
			else<br />
			{<br />
				g.DrawRectangle(pen, rect);<br />
			}<br />
		}<br />
<br />
		private System.Drawing.Rectangle CalcDragRect(int mouseX, int mouseY)<br />
		{<br />
			return Rectangle.FromLTRB( System.Math.Min(mouseX, MouseDownPos.X),<br />
										System.Math.Min(mouseY, MouseDownPos.Y),<br />
										System.Math.Max(mouseX, MouseDownPos.X),<br />
										System.Math.Max(mouseY, MouseDownPos.Y) <br />
									);<br />
		}<br />
<br />
		private void axWebBrowser1_Invalidated(object sender, InvalidateEventArgs e)<br />
		{<br />
		}<br />
<br />
		private void axWebBrowser1_Validated(object sender, EventArgs e)<br />
		{<br />
		}<br />
	}<br />
}<br />