public ActionResult LessonAction(int?id)
        {
            ViewBag.drpCourseLevel = CommonController.drpCourseLevel();
            ViewBag.drpInstrument  = CommonController.drpInstrument();
            ViewBag.drpLessonType  = CommonController.drpLessonType();

            if (id != 0)
            {
                Lesson dataset = entities.Lessons.Find(id);
                return(PartialView(dataset));
            }

            else
            {
                return(PartialView());
            }
        }
        public ActionResult LessonAction(Lesson lesson)
        {
            ModelState.Remove("LessonID");

            if (ModelState.IsValid)
            {
                string msg = "";

                if (lesson.LessonID > 0)
                {
                    var dataset = entities.Lessons.Where(f => f.LessonID == lesson.LessonID).FirstOrDefault();
                    if (dataset != null)
                    {
                        dataset.Name          = lesson.Name;
                        dataset.Description   = lesson.Description;
                        dataset.CourseLevelID = lesson.CourseLevelID;
                        dataset.LessonTypeID  = lesson.LessonTypeID;
                        dataset.InstrumentID  = lesson.InstrumentID;
                        msg = "Lesson Updated Successfully";
                    }
                }
                else
                {
                    entities.Lessons.Add(lesson);
                    msg = "New Lesson Added successfully";
                }
                entities.SaveChanges();
                return(new JsonResult
                {
                    Data = new
                    {
                        success = true,
                        action = "Lesson",
                        message = msg
                    },
                    JsonRequestBehavior = JsonRequestBehavior.AllowGet
                });
            }
            ViewBag.drpCourseLevel = CommonController.drpCourseLevel();
            ViewBag.drpLessonType  = CommonController.drpLessonType();
            ViewBag.drpInstrument  = CommonController.drpInstrument();
            return(PartialView(lesson));
        }