public ActionResult Edit(int id = 0)
{
var grade = gradeRepository.FindById(id);
if (grade == null)
{
return(HttpNotFound());
}
var studentList = from student in studentRepository.List select student;
var bookList = from book in bookRespository.List select book;
var chapterList = from chapter in chapterRepository.List select chapter;
ViewBag.Student_ID = new SelectList(studentList, "StudentId", "Name", grade.Student_ID);
ViewBag.Book_ID = new SelectList(bookList, "BookId", "Book_Name", grade.Book_ID);
ViewBag.Chapter_ID = new SelectList(chapterList, "ChapterID", "ChapterDescription");
return(PartialView("_Edit", grade));
}