public ActionResult NoteAction(int?id) { ViewBag.drpCourseLevel = CommonController.drpCourseLevel(); ViewBag.drpInstrument = CommonController.drpInstrument(); ViewBag.drpMusic = CommonController.drpMusic(); if (id != 0) { MusicSheet dataset = entities.MusicSheets.Find(id); return(PartialView(dataset)); } else { return(PartialView()); } }