Adding the HttpHandler configuration information to web.config : HTTP Modules « Development « ASP.NET Tutorial

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2. Development
3. HTTP Modules

using System;
using System.Web;

public class Handler : IHttpHandler {
    
    public void ProcessRequest (HttpContext context) {
        context.Response.ContentType = "image/jpeg";
        context.Response.WriteFile("Sunset.jpg");
    }
 
    public bool IsReusable {
        get {
            return false;
        }
    }

}