public virtual ActionResult EditSlide(long?id)
        {
            if (id == null)
            {
                return(new HttpStatusCodeResult(HttpStatusCode.BadRequest));
            }
            var slide = _slideShowService.GetByIdForEdit(id.Value);

            if (slide == null)
            {
                return(HttpNotFound());
            }
            PopulateCategoriesDropDownList(slide.ShowTransition, slide.HideTransition, slide.Position);
            return(View(slide));
        }