C#

/// Handler for when the mouse moves over the image part of the picture box
public delegate void MouseMoveOverImageHandler(object sender, MouseEventArgs e);

/// Occurs when the mouse have moved over the image part of a picture box
public event MouseMoveOverImageHandler MouseMoveOverImage;

/// Handler for when the mouse clicks over the image part of the picture box
public delegate void MouseClickedImageHandler(object sender, MouseEventArgs e);

/// Occurs when the mouse have clicked over the image part of a picture box
public event MouseMoveOverImageHandler MouseClickedImage;

protected override void OnMouseClick(MouseEventArgs e)
{
    base.OnMouseClick(e);
    if (Image != null)
    {
        if (MouseClickedImage != null)
        {
            Point p = TranslatePointToImageCoordinates(e.Location);
            if (p.X >= 0 && p.X < Image.Width && p.Y >= 0 && p.Y < Image.Height)
            {
                MouseEventArgs ne = new MouseEventArgs(e.Button, e.Clicks, p.X, p.Y, e.Delta);
                MouseClickedImage(this, ne);
            }
        }
    }
}

public class Form1 : Form<br />
    {<br />
<br />
/// <summary><br />
        /// Required designer variable.<br />
        /// </summary><br />
        private System.ComponentModel.IContainer components = null;<br />
<br />
        /// <summary><br />
        /// Clean up any resources being used.<br />
        /// </summary><br />
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param><br />
        protected override void Dispose(bool disposing)<br />
        {<br />
            if (disposing && (components != null))<br />
            {<br />
                components.Dispose();<br />
            }<br />
            base.Dispose(disposing);<br />
        }<br />
<br />
        #region Windows Form Designer generated code<br />
<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 />
            this.webBrowser1 = new System.Windows.Forms.WebBrowser();<br />
            this.button1 = new System.Windows.Forms.Button();<br />
            this.textBox1 = new System.Windows.Forms.TextBox();<br />
            this.button2 = new System.Windows.Forms.Button();<br />
            this.SuspendLayout();<br />
            // <br />
            // webBrowser1<br />
            // <br />
            this.webBrowser1.Dock = System.Windows.Forms.DockStyle.Bottom;<br />
            this.webBrowser1.Location = new System.Drawing.Point(0, 127);<br />
            this.webBrowser1.MinimumSize = new System.Drawing.Size(20, 20);<br />
            this.webBrowser1.Name = "webBrowser1";<br />
            this.webBrowser1.Size = new System.Drawing.Size(461, 257);<br />
            this.webBrowser1.TabIndex = 0;<br />
            // <br />
            // button1<br />
            // <br />
            this.button1.Dock = System.Windows.Forms.DockStyle.Top;<br />
            this.button1.Location = new System.Drawing.Point(0, 0);<br />
            this.button1.Name = "button1";<br />
            this.button1.Size = new System.Drawing.Size(461, 23);<br />
            this.button1.TabIndex = 1;<br />
            this.button1.Text = "button1";<br />
            this.button1.UseVisualStyleBackColor = true;<br />
            this.button1.Click += new System.EventHandler(this.button1_Click);<br />
            // <br />
            // textBox1<br />
            // <br />
            this.textBox1.Location = new System.Drawing.Point(22, 30);<br />
            this.textBox1.Name = "textBox1";<br />
            this.textBox1.Size = new System.Drawing.Size(377, 20);<br />
            this.textBox1.TabIndex = 2;<br />
            // <br />
            // button2<br />
            // <br />
            this.button2.Location = new System.Drawing.Point(0, 56);<br />
            this.button2.Name = "button2";<br />
            this.button2.Size = new System.Drawing.Size(461, 23);<br />
            this.button2.TabIndex = 3;<br />
            this.button2.Text = "button2";<br />
            this.button2.UseVisualStyleBackColor = true;<br />
            this.button2.Click += new System.EventHandler(this.button2_Click);<br />
            // <br />
            // Form1<br />
            // <br />
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);<br />
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;<br />
            this.ClientSize = new System.Drawing.Size(461, 384);<br />
            this.Controls.Add(this.button2);<br />
            this.Controls.Add(this.textBox1);<br />
            this.Controls.Add(this.button1);<br />
            this.Controls.Add(this.webBrowser1);<br />
            this.Name = "Form1";<br />
            this.Text = "Form1";<br />
            this.Load += new System.EventHandler(this.Form1_Load);<br />
            this.ResumeLayout(false);<br />
            this.PerformLayout();<br />
<br />
        }<br />
<br />
        #endregion<br />
<br />
        private System.Windows.Forms.WebBrowser webBrowser1;<br />
        private System.Windows.Forms.Button button1;<br />
        private System.Windows.Forms.TextBox textBox1;<br />
        private System.Windows.Forms.Button button2;<br />
<br />
<br />
        public Form1()<br />
        {<br />
            InitializeComponent();<br />
        }<br />
<br />
        private void Form1_Load(object sender, EventArgs e)<br />
        {<br />
            this.webBrowser1.Navigate("about:blank");<br />
        }<br />
<br />
        private void button1_Click(object sender, EventArgs e)<br />
        {<br />
            this.webBrowser1.Document.Body.InnerHtml += "<br />Clicked!";<br />
        }<br />
<br />
        private void button2_Click(object sender, EventArgs e)<br />
        {<br />
            this.webBrowser1.Document.Body.InnerHtml += "<br />" + this.textBox1.Text;<br />
        }<br />
    }