ComboxEdit实现二级联动

private void cmbXPROVINCE_SelectedIndexChanged(object sender, EventArgs e)
        {
            DataBind(cmbXPROVINCE, cmbXROAD);
        }

        /// <summary>
        /// 实现省、市
        /// </summary>
        /// <param name="cmbFirst">一级（区市）</param>
        /// <param name="cmbSecond">二级（街道）</param>
        public void DataBind(ComboBoxEdit cmbFirst, ComboBoxEdit cmbSecond)
        {
            switch (cmbFirst.Text.Trim())
            {
                case "河南省":
                    cmbSecond.Properties.Items.Clear();
                    cmbSecond.Text = "";
                    cmbSecond.Properties.Items.Add("郑州市");
                    cmbSecond.Properties.Items.Add("开封市");
                    cmbSecond.Properties.Items.Add("驻马店市");
                    cmbSecond.Properties.Items.Add("安阳市");
                    cmbSecond.Properties.Items.Add("洛阳市");
                    cmbSecond.Properties.Items.Add("周口市");

                    break;
                   
                case "河北省":
                    cmbSecond.Properties.Items.Clear();
                    cmbSecond.Text = "";
                    cmbSecond.Properties.Items.Add("保定");
                    cmbSecond.Properties.Items.Add("石家庄");
                    cmbSecond.Properties.Items.Add("邯郸");
                    break;
                //..........

                default:
                    break;
            }
        }