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;
             }
         }