@foreach ($CoursePeriods as $CoursePeriod)
          <option
                          @if($CoursePeriod_id)
                                          @if($CoursePeriod->id===$CoursePeriod_id)
                                                          selected
                                          @endif
                          @endif             
          value="{{$CoursePeriod->id}}">{{ $CoursePeriod->title}}</option>
@endforeach