public bool IsCourseExist(int courseID)
        {
            //TeacherManager aTeacherManager = new TeacherManager();
            //DepartmentManager aDepartmentManager = new DepartmentManager();
            //CourseManager aCourseManager = new CourseManager();
            CourseAssignGateway aCourseAssignGateway = new CourseAssignGateway();
            bool isCourseExists = aCourseAssignGateway.IsCourseExist(courseID);

            return(isCourseExists);
        }