سلام
من کلاس زیر را تعریف کرده ام

public class User
    {
        public string Name { get; set; }
        public string Family { get; set; }
    }

 public ActionResult About()
        {
            var u = new List<User> {new User {Name = "a", Family = "b"}};
            var test = JsonConvert.SerializeObject(u);
            ViewBag.bc=test.n
            return View();
        }