public IActionResult Create(int ID, int CourseId)
        {
            var vm = new ChapterVM();

            if (ID != 0)
            {
                var model = _chapterService.GetById(ID);
                if (model == null)
                {
                    return(NotFound());
                }
                vm = _mapper.Map <ChapterVM>(model);
            }
            else
            {
                var numChapter = _chapterService.CountCondition(m => m.CourseId == CourseId);
                vm.OrderChapter = ++numChapter;
                vm.CourseId     = CourseId;
            }
            return(View(vm));
        }