public List <Models.ClassTeacherSchedule.GradeCourseModel> GetGradeCourses()
        {
            BusinessLogic.ClassTeacherSchedule.GradeCourseManager GradeCourseManager = new BusinessLogic.ClassTeacherSchedule.GradeCourseManager();

            List <BusinessEntity.ClassTeacherSchedule.GradeCourseEntity> GradeCourses      = GradeCourseManager.GetGradeCourses();
            List <Models.ClassTeacherSchedule.GradeCourseModel>          GradeCourseModels = new List <Models.ClassTeacherSchedule.GradeCourseModel>();

            foreach (BusinessEntity.ClassTeacherSchedule.GradeCourseEntity GradeCourse in GradeCourses)
            {
                GradeCourseModels.Add(new Models.ClassTeacherSchedule.GradeCourseModel(GradeCourse));
            }

            return(GradeCourseModels);
        }