private void UpdateComboOrders() { int selectedCustomerId = int.Parse(cbClients.SelectedItem.ToString().Substring(0, 2)); cbOrder.Items.Clear(); orderData.GetOrdersByClient(selectedCustomerId).ForEach(o => cbOrder.Items.Add(o.ID)); // Clearing the text of order if (cbOrder.Items.Count > 0) { cbOrder.Text = cbOrder.Text = cbOrder.Items[0].ToString(); } else { cbOrder.Text = ""; } }