public ActionResult AddLOsToCourse(Course course)
        {
            string stringOfLoIds = Request["selectedIds"];
            if (!stringOfLoIds.IsEmpty())
            {
                List<string> listOfLoIds = stringOfLoIds.Split(',').ToList();
                foreach (var id in listOfLoIds)
                {
                    var id1 = id;
                    var lo = _dbContext.LOs.Find(x => x.Id == ObjectId.Parse(id1)).SingleAsync().Result;
                    if (lo != null)
                    {
                        course.Duration += lo.Duration;
                        course.AddLo(lo.Id);
                    }
                }
            }

            ModelState.Clear();
            if (course.Id != ObjectId.Empty)
            {
                _logger.Trace("LO or LOs added to course during course editing");
                return View("EditCourse", course);
            }
            else
            {
                _logger.Trace("LO or LOs added to course during manual course creating");
                return View("ManualCourseCreating", course);
            }
        }
        public ActionResult AddLOsToCourse(Course course)
        {
            string stringOfLoIds = Request["selectedIds"];
                if (!stringOfLoIds.IsEmpty())
                {
                    List<string> listOfLoIds = stringOfLoIds.Split(',').ToList();
                    foreach (var id in listOfLoIds)
                    {
                        //var lo = db.GetLOByID(id);
                        var lo = _dbContext.LOs.Find(x => x.Id == ObjectId.Parse(id)).ToListAsync().Result;
                        if (lo != null)
                        {
                            course.AddLo(ObjectId.Parse(id));
                        }
                    }
                }

                if (course.Id != ObjectId.Empty)
                {
                    return View("EditCourse", course);
                }
                else
                {
                    return View("ManualCourseCreating", course);
                }
        }