using System; using System.Web; using System.Drawing; using System.Drawing.Imaging; using System.Text; using System.Web.SessionState; public class Handler : 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 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"; string letter; StringBuilder sb = new StringBuilder(); for (int x = 0; x < 5; x++) { letter = letters.Substring(r.Next(0, letters.Length - 1), 1); sb.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"] = sb; context.Response.End(); } public bool IsReusable { get { return true; } } }How To Use <img src="Handler.ashx" alt="Random Image" />
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How To Generate Random Image Using HttpHandler in ASP.NET
How to construct an image generator used to create a visual security code that helps prevent automated sign ups in your web applications.The text generated is stored in Session to be used for comparison to the user's input.
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