private async void OnUpdateSpecialty()
{
SelectedSpeciality.Faculty = Faculties.FirstOrDefault(f => f.FacultyId == SelectedSpeciality.FacultyId);
var result = await _repo.UpdateSpecialtyAsync(SelectedSpeciality);
var specialty = Specialities.FirstOrDefault(s => s.SpecialtyId == SelectedSpeciality.SpecialtyId);
specialty.CopyProperties(SelectedSpeciality);
}