public JsonResult GetStudentAndResult(int studentId)
        {
            var student = studentManager.GetAllStudentWithDepartmentNames();
            var studentResultDetails = studentResultManager.GetAllStudentResultDetails();

            var selectedStudent = student.Find(s => s.StudentId == studentId);
            var selectedStudentResultDetails = studentResultDetails.Where(s => s.StudentId == studentId).ToList();

            TempData["Id"] = studentId;
            StudentAndResult studentAndResult = new StudentAndResult();

            studentAndResult.Student = selectedStudent;
            studentAndResult.StudentResultDetails = selectedStudentResultDetails;

            return(Json(studentAndResult));
        }