private void libCity_Click(object sender, EventArgs e) { try { libBookingID.Items.Clear(); List <string> bookingIDs = new List <string>(); List <string> status = new List <string>(); string adress = libCity.SelectedItem.ToString(); bookingIDs = CC.GetBookingID(adress); status = CC.GetStatus(adress); int i = 0; foreach (string s in bookingIDs) { libBookingID.Items.Add(s + ", " + status[i]); i++; } } catch (Exception) { MessageBox.Show("Connection error"); } }