private void toolStripComboBox1_SelectedIndexChanged(object sender, EventArgs e) { string curent_index = toolStripComboBox1.SelectedIndex.ToString(); switch (curent_index) { case "0": Editor_distanation firstForm = new Editor_distanation(); firstForm.ShowDialog(); break; case "1": Form2 secondForm = new Form2(Glades.trains); secondForm.ShowDialog(); break; case "2": Editor_passanger thirdForm = new Editor_passanger(); thirdForm.ShowDialog(); break; } }