public ActionResult Delete(int id)
        {
            var testimonials = testimonialsService.GetById(id);

            if (testimonials == null)
            {
                this.NotifyError("Item not found.");
                return(RedirectToAction("List"));
            }
            else
            {
                var deleted = testimonialsService.Delete(testimonials);
                if (deleted)
                {
                    this.NotifySuccess("Successfully deleted.");
                }
                else
                {
                    this.NotifyError("Item can not deleted!");
                }
            }

            return(RedirectToAction("List"));
        }