How can I add new controller with url routing?

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MVC3

routing

I have a project that serves some blog data and pictures. I created controllers and also actions for both blog and pictures.

I updated Global.asax.cs to create user friendly urls. No problem till here.

Now I want to add a simple controller which is Comment and an action which is AddComment.

When I did this usual operations, and tried to access MyProject/Comment/AddComment; it returns 404 not found error.

How should I update my global.asax.cs for adding comment?

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Web.Routing;

namespace PersonalApp
{
    // Note: For instructions on enabling IIS6 or IIS7 classic mode, 
    // visit http://go.microsoft.com/?LinkId=9394801

    public class MvcApplication : System.Web.HttpApplication
    {
        public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            filters.Add(new HandleErrorAttribute());
        }

        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute(
                "Default", // Route name
                "{controller}/{type}/{id}", // URL with parameters
                new { controller = "Blog", action = "Index", id = UrlParameter.Optional, type = UrlParameter.Optional } // Parameter defaults
            );

            routes.MapRoute(
              "BlogFix", // Route name
              "{controller}/{action}/{id}", // URL with parameters
              new { controller = "Blog", action = "Index", ad = UrlParameter.Optional } // Parameter defaults
          );



            routes.MapRoute(
                 "ArticleWithoutAction",              // Article Without Action name
                 "{controller}/{gelenId}/{title}/{date}",
                 new
                 {
                     controller = "Blog",
                     action = "ReadMore",
                     gelenId = UrlParameter.Optional,
                     title = UrlParameter.Optional,
                     date = UrlParameter.Optional
                 } // Parameter defaults
             );

            routes.MapRoute(
                "ArticleWithAction",                  // Article With Action name 
                "{controller}/{action}/{gelenId}/{title}/{date}",
                new
                {
                    controller = "Blog",
                    action = "ReadMore",
                    gelenId = UrlParameter.Optional,
                    title = UrlParameter.Optional,
                    date = UrlParameter.Optional
                } // Parameter defaults
            );

            routes.MapRoute(
                "DefaultB", // Route name
                "{controller}/{action}",
                new
                {
                    controller = "Blog",
                    action = "ReadMore"
                } // Parameter defaults
            );






            routes.MapRoute(
                "DefaultOfImage", // Route name
                "{controller}/{type}/{id}", // URL with parameters
                new { controller = "Image", action = "Index", id = UrlParameter.Optional, type = UrlParameter.Optional } // Parameter defaults
            );

            routes.MapRoute(
              "ImageFix", // Route name
              "{controller}/{action}/{id}", // URL with parameters
              new { controller = "Image", action = "Index", ad = UrlParameter.Optional } // Parameter defaults
          );

            routes.MapRoute(
                 "ImageWithoutAction",              // Image Without Action name
                 "{controller}/{gelenId}/{title}/{date}",
                 new
                 {
                     controller = "Image",
                     action = "Show",
                     gelenId = UrlParameter.Optional,
                     title = UrlParameter.Optional,
                     date = UrlParameter.Optional
                 } // Parameter defaults
             );

            routes.MapRoute(
                "ImageWithAction",                  // Image With Action name 
                "{controller}/{action}/{gelenId}/{title}/{date}",
                new
                {
                    controller = "Image",
                    action = "Show",
                    gelenId = UrlParameter.Optional,
                    title = UrlParameter.Optional,
                    date = UrlParameter.Optional
                } // Parameter defaults
            );

            routes.MapRoute(
                "DefaultImage2", // Route name
                "{controller}/{action}",
                new
                {
                    controller = "Image",
                    action = "Show"
                } // Parameter defaults
            );


          
       







        }

        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();

            RegisterGlobalFilters(GlobalFilters.Filters);
            RegisterRoutes(RouteTable.Routes);
        }
    }
}

Thanks.