Create Dinamic Image for Security signup

<%@ WebHandler Language="C#" Class="Image" %>

using System;

using System.Web;

using System.Drawing;

using System.Drawing.Imaging;


using System.Text;

using System.Web.SessionState;

class Image : IHttpHandler, IRequiresSessionState
{public void ProcessRequest(HttpContext context)

{context.Response.ContentType = "image/gif";

Bitmap b = new Bitmap(200, 60);

Graphics g = Graphics.FromImage(b);

g.FillRectangle(new SolidBrush(Color.White), 0, 0, 200, 60);

Font font = new Font(FontFamily.GenericSansSerif, 48, FontStyle.Bold, GraphicsUnit.Pixel);

Random r = new Random();

string letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ123456789";

string letter;

StringBuilder Lt = new StringBuilder();

for (int x = 0; x < 5; x++)

{letter = letters.Substring(r.Next(0, letters.Length - 1), 1);

Lt.Append(letter);

g.DrawString(letter, font, new SolidBrush(Color.Black), x * 38, r.Next(0, 15));

}

Pen linepen = new Pen(new SolidBrush(Color.Black), 2);

for (int x = 0; x < 6; x++)

g.DrawLine(linepen, new Point(r.Next(0, 199), r.Next(0, 59)), new Point(r.Next(0, 199), r.Next(0, 59)));

b.Save(context.Response.OutputStream, ImageFormat.Gif);

context.Session["image"] =Lt;

context.Response.End();

}

public bool IsReusable

{get{return true;}

}

}