private async void Button_Add(object sender, RoutedEventArgs e)
 {
     if (AccomodationDataGrid.Items.Count < 5)
     {
         AccommodationInfo newAddAccommodationWindow = new AccommodationInfo(null);
         newAddAccommodationWindow.ShowDialog();
         await LoadAccomodation();
     }
     else
     {
         MessageBox.Show("There can be only 5 accommodations");
     }
 }
        private async void EditAccomodation_Click(object sender, RoutedEventArgs e)
        {
            if (AccomodationDataGrid.SelectedIndex >= 0)
            {
                var accomodation = await accomodationCore.GetAccommodationInfoByIdAsync(((AccommodationInfoDTO)AccomodationDataGrid.SelectedItem).AccommodationInfoId);

                AccommodationInfo newAccommodationInfoWindow = new AccommodationInfo(accomodation);
                newAccommodationInfoWindow.ShowDialog();
                await LoadAccomodation();
            }
            else
            {
                MessageBox.Show("Choose accomodation first");
            }
        }