public ActionResult ApproveAllRequests(string id)
        {
            RequestDAO requestDAO = new RequestDAO();

            if (!requestDAO.ApproveAllRequests(id))
            {
                SetFlash(Enums.FlashMessageType.Error, "Something went wrong!");

                return(RedirectToAction("ReviewStationeryRequest", "DepartmentHead"));
            }
            SetFlash(Enums.FlashMessageType.Success, "Great! You've successfully approved all requests");

            return(RedirectToAction("ReviewStationeryRequest", "DepartmentHead"));
        }