public List <CourseAssignToTeacherModel> GetAllCourseAssignedTeachers()
{
//TeacherManager aTeacherManager = new TeacherManager();
//DepartmentManager aDepartmentManager = new DepartmentManager();
//CourseManager aCourseManager = new CourseManager();
CourseAssignGateway aCourseAssignGateway = new CourseAssignGateway();
return(aCourseAssignGateway.GetAllCourseAssignedTeachers());
}