When you create a Generic Handler, you create a file that ends with the extension .ashx. Whenever you request the .ashx file, the Generic Handler executes. A Generic Handler is like an ASP.NET page that contains a single method that renders content to the browser. You can't add any controls declaratively to a Generic Handler. A Generic Handler doesn't support events such as the Page Load or Page PreRender events. File: ImageTextHandler.ashx <%@ WebHandler Language="C#" Class="ImageTextHandler" %> using System; using System.Web; using System.Drawing; using System.Drawing.Imaging; public class ImageTextHandler : IHttpHandler { public void ProcessRequest(HttpContext context) { string text = context.Request.QueryString["text"]; string font = context.Request.QueryString["font"]; string size = context.Request.QueryString["size"]; Font fntText = new Font(font, float.Parse(size)); Bitmap bmp = new Bitmap(10, 10); Graphics g = Graphics.FromImage(bmp); SizeF bmpSize = g.MeasureString(text, fntText); int width = (int)Math.Ceiling(bmpSize.Width); int height = (int)Math.Ceiling(bmpSize.Height); bmp = new Bitmap(bmp, width, height); g.Dispose(); g = Graphics.FromImage(bmp); g.Clear(Color.White); g.DrawString(text, fntText, Brushes.Black, new PointF(0, 0)); g.Dispose(); bmp.Save(context.Response.OutputStream, ImageFormat.Gif); } public bool IsReusable { get { return true; } } } You specify the image that you want to return from the handler by making a request that looks like this: /ImageTextHandler.ashx?text=Hello&font=Arial&size=30 The IsReusable property indicates whether the same handler can be reused over multiple requests. The following page uses the ImageTextHandler.ashx file. <%@ Page Language="C#" %> "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> Show ImageTextHandler