public ActionResult AllstudentResult(string courseId, string batch)
        {
            MarksManagersrb  aManagersrb       = new MarksManagersrb();
            CourseManagersrb aCourseManagersrb = new CourseManagersrb();

            ViewBag.courses = aCourseManagersrb.Getallcourse();
            List <StudentMarks> allstudents = aManagersrb.GetAllMarks(courseId, batch);

            ViewBag.list = allstudents;
            return(View());
        }