public void SetStudentList()
        {
            var stds = StudentRepo.FindByQuery(" ClassID = " + SelectedClassID);

            if (stds != null)
            {
                List <CustomDropDownValues> _list = new List <CustomDropDownValues>();
                foreach (var item in stds)
                {
                    CustomDropDownValues _temp = new CustomDropDownValues {
                        DisplayName = item.FullName, DisplayID = item.StudentID.ToString()
                    };
                    _list.Add(_temp);
                }
                StudentDropDown = _list;
            }
            else
            {
                StudentDropDown = null;
            }
        }
        public void SetSubjectList(int classID)
        {
            var subjects = ClassSubjectRepo.GetSelectedSubjects(classID);

            if (subjects != null)
            {
                List <CustomDropDownValues> _list = new List <CustomDropDownValues>();
                foreach (var item in subjects)
                {
                    CustomDropDownValues _temp = new CustomDropDownValues {
                        DisplayName = item.Description, DisplayID = item.SubjectID.ToString()
                    };
                    _list.Add(_temp);
                }
                SubjectDropDown = _list;
            }
            else
            {
                SubjectDropDown = null;
            }
        }