Global.asax.cs

public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);

            // Need to include your bundles
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
    }