public ActionResult SignUp(int id, bool?back = false) { session.SetLoadedPage(id); var email = id != 1 ? session.GetString(CurrentPaEmail) : string.Empty; var model = accountCreationViewModelBuilder.Build(email); return(back.HasValue && back.Value ? GetPreviousView(id, FormSection.SignUp, model) : GetNextView(id, FormSection.SignUp, model)); }