public async void SaveEntity(object sender, RoutedEventArgs e) { SelectedItem.Name = TextName.Text; SelectedItem.Surname = TextSurname.Text; SelectedItem.DateOfBirth = DateTime.Parse(TextDeteOfBirth.Text); var id = SelectedItem.Id; SelectedItem.Id = Guid.NewGuid(); await _stewardessService.UpdateEntityAsync(id.ToString(), SelectedItem); TextId.IsReadOnly = false; SaveButton.Visibility = Visibility.Collapsed; await ReloadEntitiesAsync(); }