private static CarsSaleUserManager Create(IOwinContext context)
        {
            var db    = context.Get <CarsSaleDbContext>();
            var store = new UserStore <CarsSaleUser,
                                       CarsSaleRole,
                                       int,
                                       CarsSaleLogin,
                                       CarsSaleUserRole,
                                       CarsSaleClaim>(db);
            var manager = new CarsSaleUserManager(store);

            return(manager);
        }