Ninject InSingletonScope for asp.net mvc 4 - ninject

Question

I am trying to use the InSingletonScope for one of my service interface. However it is still creating a new instance of the object per web request. basically it behaves like an InRequestScope in my asp.net mvc 4 application.
I thought InSingletonScope is for the life time of the IIS process?
I register the following implementation for the interface in one of my NinjectModule. if I resolve it right away, repo1 and repo2 are actually the same instance. However, in my controller every request result in a new instance.
-------------------- Module registration
public class RepositoryModule : NinjectModule
{
#region Overrides of NinjectModule
public override void Load()
{
Bind<IFakeRepository>().To<FakeRepository>().InSingletonScope();
// following code onle execute the constructor once
var repo1String = Kernel.Get<IFakeRepository>().GetString();
var repo2String = Kernel.Get<IFakeRepository>().GetString();
}
#endregion
}
-------------------- Repository interface and implementation
public interface IFakeRepository
{
string GetString();
}
public class FakeRepository : IFakeRepository
{
public FakeRepository()
{
// every web request execute this constructor
Debug.Write("FakeRepository constructor called");
}
#region Implementation of IFackRepository
public string GetString()
{
return "dummy string";
}
#endregion
}
------------------ web api controller
public class TestRepoController : ApiController
{
public IFakeRepository FakeRepository { get; set; }
public TestRepoController(IFakeRepository fakeRepository)
{
FakeRepository = fakeRepository;
}
public string Get()
{
return FakeRepository.GetString();
}
}
----------------- web api route registration
config.Routes.MapHttpRoute(
name: "TestTakeRoutePost",
routeTemplate: "Fake",
defaults: new { controller = "TestRepo" }
);
----------------- NinjectWebCommon
[assembly: WebActivator.PreApplicationStartMethod(typeof(PNI.MediaServer.Application.App_Start.NinjectWebCommon), "Start")]
[assembly: WebActivator.ApplicationShutdownMethodAttribute(typeof(PNI.MediaServer.Application.App_Start.NinjectWebCommon), "Stop")]
public static class NinjectWebCommon
{
private static readonly Bootstrapper bootstrapper = new Bootstrapper();
/// <summary>
/// Starts the application
/// </summary>
public static void Start()
{
DynamicModuleUtility.RegisterModule(typeof(OnePerRequestHttpModule));
DynamicModuleUtility.RegisterModule(typeof(NinjectHttpModule));
bootstrapper.Initialize(CreateKernel);
}
/// <summary>
/// Stops the application.
/// </summary>
public static void Stop()
{
bootstrapper.ShutDown();
}
/// <summary>
/// Creates the kernel that will manage your application.
/// </summary>
/// <returns>The created kernel.</returns>
private static IKernel CreateKernel()
{
var kernel = new StandardKernel();
//load all Binds defined in the classes that inherit NinhectModule
kernel.Load(Assembly.GetExecutingAssembly());
kernel.Bind<Func<IKernel>>().ToMethod(ctx => () => new Bootstrapper().Kernel);
kernel.Bind<IHttpModule>().To<HttpApplicationInitializationHttpModule>();
// Set Web API Resolver
GlobalConfiguration.Configuration.DependencyResolver = new PniNinjectDependencyResolver(kernel);
return kernel;
}
}