public ActionResult AllStudents(string Result, string graceResult)
        {
            List <StudentData> studentsList = _service.RetreiveStudentsList();

            if (Result != null)
            {
                ViewBag.Result = "viewPassOrFail";
            }

            if (graceResult != null)
            {
                ViewBag.Result = "viewPassOrFail";

                List <StudentData> AddedGraceMarkList = GraceMarksLogic(studentsList);

                AddedGraceMarkList = studentsList;

                ViewBag.StudentsList = AddedGraceMarkList;
            }

            ViewBag.StudentsList = studentsList;

            return(View());
        }