public SyncService(IDialogService dialogService, ITeacherSQLDataService teacherSQLDataService, ITeacherDataService teacherDataService, IConnectionService connectionService,
                    ISettingsService settingsService)
 {
     _connectionService     = connectionService;
     _settingsService       = settingsService;
     _teacherDataService    = teacherDataService;
     _teacherSQLDataService = teacherSQLDataService;
     _dialogService         = dialogService;
     _connectionService.ConnectivityChanged += Connectivity_ConnectivityChanged;
 }
 public SignupService(IStudentDataService studentData, ICourseDataService courseData, ITeacherDataService teacherData)
 {
     _studentData = studentData;
     _courseData  = courseData;
     _teacherData = teacherData;
 }