MVC - Testing Windows Authentication And Local Express DB

I am testing with windows authentication and a local express DB. My DB has users and roles tables. Following link explains this concept:[URL]

Code:

[HandleError]
public class HomeController : Controller
{
public ActionResult Index()
{
return View();
}
[Authorize(Roles = "Managers")]
public ActionResult CompanySecrets()
{
return View();
}
[Authorize(Users="redmond\swalther")]
public ActionResult StephenSecrets()
{
return View();
}
}

Above roles are coming from NTLM. Is there a way where i can map roles in my DB table so that these are then available to me like User.IsInRoles("Admin") etc?