public LecturerStudentAnalyticsViewModel(IAuthService authService, ILecturerService lecturerService)
{
_authService = authService;
_lecturerService = lecturerService;
selectedLecturer = _authService.authorisedUser;
NoOfGraduatedStudents = selectedLecturer.Course == null ?
0 :
_lecturerService.GetGraduatedStudents(selectedLecturer.Course);
LecturerResults = _lecturerService.GetLecturerResults(selectedLecturer);
}