private void buttonSave_Click(object sender, EventArgs e) { if (comboBoxCorpus.SelectedIndex >= 0 && comboBoxFloor.SelectedIndex >= 0) { int floor = (int)comboBoxFloor.SelectedItem; int num = (int)numericUpDown1.Value; ControlFunctions.EditCabinet(cabinet, comboBoxCorpus.Text, floor, num); this.Close(); } else { MessageBox.Show("Заполните поля"); } }