“Controller, Action, Model” not all code paths return a value

Question

I am really confused by this error "not all code paths return a value" on my action PostResponse. I have stared at my model, controller and view for hours and I think

Answer 1

Worked it out; but it was almost from scratch, as I created a new ViewModel and used that to populate the responses.

        [HttpPost]
    public ActionResult ViewQuestion([Bind(Include = "QuestionId, Answer, UserId")] ResponseViewModel responseViewModel)
    {

        Response re = new Models.Response();
            re.Answer = responseViewModel.Answer;
            re.UserId = responseViewModel.UserId;
            re.QuestionId = responseViewModel.QuestionId;
            re.DateStamp = System.DateTime.Now;
            db.Responses.Add(re);
            db.SaveChanges();

        return RedirectToAction("ViewQuestion");
    }

Thanks for your input as your comments got the old head working again. Thanks!