public ActionResult NewTestimonial(NewTestimonialViewModel model)
        {
            var customerid = _bookManagement.Get(b => b.ID == model.Testimonial.BookID).CustomerID;

            model.Testimonial.CustomerID = customerid;

            model.Testimonial.IsShow = ConvertHelpers.ConvertIntToBool(model.ShowingStatus);

            _testimonialsManagement.AddOrUpdate(model.Testimonial);
            this.SuccessMessage("This testimonial has been saved!");

            return(RedirectToAction("Index", "TestimonialManagement"));
        }