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);
}