private void FillComboBoxes() { AddCarPresenter presenter = new AddCarPresenter(this); Dictionary <string, string[]> comboBoxesValues = presenter.FillComboboxes(); this.categoryComboBox.Items.AddRange(comboBoxesValues["category"]); this.driveTypeComboBox.Items.AddRange(comboBoxesValues["driveType"]); this.engineComboBox.Items.AddRange(comboBoxesValues["engine"]); this.gearboxComboBox.Items.AddRange(comboBoxesValues["gearbox"]); }