public async void SaveEntity(object sender, RoutedEventArgs e) { SelectedItem.Name = TextAirplaneName.Text; SelectedItem.AirplaneType = AirplaneTypeDtos .FirstOrDefault(airplaneType => airplaneType.Model == TextAirplaneName.Text); SelectedItem.DateOfIssue = DateTime.Parse(TextDateOfIssue.Text); SelectedItem.LifeTime = TimeSpan.Parse(TextLifeTime.Text); var id = SelectedItem.Id; SelectedItem.Id = Guid.NewGuid(); await _airplaneService.UpdateEntityAsync(id.ToString(), SelectedItem); TextId.IsReadOnly = false; SaveButton.Visibility = Visibility.Collapsed; await LoadAirplaneAsync(); }