public CoursesTakenController(CourseTakenRepository courseTakenRepository, CourseRepository courseRepository, StudentRepository studentRepository)
 {
     this.courseTakenRepository = courseTakenRepository;
     this.courseRepository = courseRepository;
     this.studentRepository = studentRepository;
 }
 public DomainCourseService(CourseRepository courseRepository, CourseTakenRepository courseTakenRepository)
 {
     this.courseRepository = courseRepository;
     this.courseTakenRepository = courseTakenRepository;
 }
 public DomainStudentService(StudentRepository studentRepository, CourseTakenRepository courseTakenRepository)
 {
     this.studentRepository = studentRepository;
     this.courseTakenRepository = courseTakenRepository;
 }