public ActionResult UpdateGrade(int id)
        {
            Dictionary <string, object> allInfo = new Dictionary <string, object>();
            List <StudentClass>         student = StudentClass.FindById(id);
            List <CourseClass>          courses = JoinTableClass.GetCoursesByStudentId(id);
            List <bool> classStatus             = new List <bool>()
            {
            };

            foreach (CourseClass course in courses)
            {
                bool status = JoinTableClass.FindStatusByStudentAndCourseId(id, course.GetId());
                classStatus.Add(status);
            }
            allInfo.Add("student", student);
            allInfo.Add("courses", courses);
            allInfo.Add("status", classStatus);
            return(View(allInfo));
        }