Working on JSON objects in jQuery and MVC

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

namespace JsonMVC
{
    public class JsonModelBinder : DefaultModelBinder
    {
        public override object BindModel(ControllerContext controllerContext,
            ModelBindingContext bindingContext)
        {
            // If the request is not of content type "application/json"
            // then use the default model binder.
            if (!IsJSONRequest(controllerContext))
            {
                return base.BindModel(controllerContext, bindingContext);
            }

            // Get the JSON data posted
            var request = controllerContext.HttpContext.Request;
            var jsonStringData =
                new System.IO.StreamReader(request.InputStream).ReadToEnd();

            return new System.Web.Script.Serialization.JavaScriptSerializer()
                .Deserialize(jsonStringData, bindingContext.ModelMetadata.ModelType);
        }

        private bool IsJSONRequest(ControllerContext controllerContext)
        {
            var contentType = controllerContext.HttpContext.Request.ContentType;
            return contentType.Contains("application/json");
        }
    }

    public class MvcApplication : System.Web.HttpApplication
    {
        public static void RegisterRoutes(RouteCollection routes)
        {
            routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

            routes.MapRoute("Default", "{controller}/{action}/{id}",
                new
                {
                    controller = "Home",
                    action = "Index",
                    id = UrlParameter.Optional
                });
        }

        protected void Application_Start()
        {
            // Set the model binder
            ModelBinders.Binders.DefaultBinder = new JsonModelBinder();
            AreaRegistration.RegisterAllAreas();
            RegisterRoutes(RouteTable.Routes);
        }

        protected void Application_BeginRequest(object sender, EventArgs e)
        {
            // It is OK to cache the jQuery library, images, etc.
            string FilePath = HttpContext.Current.Request.FilePath;
            if (FilePath.Contains("jquery-1.4.2.min.js") ||
                FilePath.Contains("rubik.ico") ||
                FilePath.Contains(".jpg") ||
                FilePath.Contains(".css"))
                return;

            HttpContext.Current.Response.Cache.SetCacheability(HttpCacheability.NoCache);
            HttpContext.Current.Response.Cache.SetNoStore();
        }
    }
}