private void AddCustomerCarButton_OnClick(object sender, RoutedEventArgs e) { string name = SearchCustomerNameTextBox.Text; string firstName = SearchCustomerFirstNameTextBox.Text; string phoneNumber = SearchCustomerPhoneNumberTextBox.Text; var customer = _client.FindCustomer(name, firstName, phoneNumber); DataRowView row = (DataRowView)DisplayChassisDataGrid.SelectedItem; string codSasiu = row["CodSasiu"].ToString(); Sasiu sasiu = _client.FindChassisByCode(codSasiu); string autoNumber = AddCustomerCarAutoNumberTextBox.Text; string chassisSeries = AddCustomerCarChassisSeriesTextBox.Text; Auto auto = new Auto() { SasiuId = sasiu.Id, ClientId = customer.Id, NumarAuto = autoNumber, SerieSasiu = chassisSeries }; _client.AddAuto(auto); AddCarDisplayInfoTextBlock.Text = @"Car added."; AddCarDisplayInfoTextBlock.Visibility = Visibility.Visible; string getClientCars = $"SELECT * FROM Automobile WHERE ClientId = {customer.Id}"; ExecuteQuery(getClientCars, SearchCustomerDataGrid); }