public async void DeleteStewardess()
 {
     if (await service.DeleteEntity(SelectedStewardess.Id))
     {
         Stewardesses.Remove(Stewardesses.FirstOrDefault(c => c.Id == SelectedStewardess.Id));
     }
 }
        private async void DeleteStewardess()
        {
            try
            {
                await _service.DeleteAsync(SelectedStewardess.Id);

                Stewardesses.Remove(SelectedStewardess);
            }
            catch (System.InvalidOperationException ex)
            {
                await _dialogService.ShowMessage(ex.Message, "Error");
            }
        }
 private async void BtnDelete_OnClick(object sender, RoutedEventArgs e)
 {
     Canvas.Visibility = Visibility.Visible;
     try
     {
         await Service.Delete(_selectedStewardess.Id);
     }
     catch
     {
         Info.Text = "Server error!";
     }
     Stewardesses.Remove(_selectedStewardess);
 }
        private async void UpdateStewardess()
        {
            try
            {
                var resultItem = await _service.UpdateAsync(SelectedStewardess);

                Stewardesses.Remove(SelectedStewardess);
                Stewardesses.Insert(0, resultItem);
            }
            catch (System.InvalidOperationException ex)
            {
                await _dialogService.ShowMessage(ex.Message, "Error");
            }
        }