extjs 控件下拉框

前台页面代码

<ext:ComboBox ID="getYear" runat="server" Width="150" FieldLabel="年度" EmptyText="请选择..." Editable="false">
                                        <Listeners>
                                            <Change Handler="highYear.setValue(getYear.getValue());" />
                                        </Listeners>
                                    </ext:ComboBox>
                                    <ext:Label ID="Month" runat="server" Text="月：" />
                                    <ext:ComboBox ID="getMonth" runat="server" Width="150" FieldLabel="月度" EmptyText="请选择..." Editable="false">
                                        <Listeners>
                                            <Change Handler="highMonth.setValue(getMonth.getValue());" />
                                        </Listeners>
                                    </ext:ComboBox>



后台代码
#region 绑定年度月度下拉
    private void DataBindYearMonth()
    {
        for (int i = 2010; i <= 2020; i++)
        {
            Coolite.Ext.Web.ListItem listItem = new Coolite.Ext.Web.ListItem(i.ToString(), i.ToString());
            cbbYear.Items.Add(listItem);
            getYear.Items.Add(listItem);//获取年查询
            highYear.Items.Add(listItem);//获取年查询(高级)
        }
        for (int i = 1; i <= 12; i++)
        {
            Coolite.Ext.Web.ListItem listItem = new Coolite.Ext.Web.ListItem(i.ToString(), i.ToString());
            cbbMonth.Items.Add(listItem);
            getMonth.Items.Add(listItem);//获取月查询
            highMonth.Items.Add(listItem);//获取月查询(高级)

        }
        cbbYear.SelectedItem.Value = DateTime.Now.Year.ToString();
        cbbMonth.SelectedItem.Value = (DateTime.Now.Month + 1).ToString();
    }
       
    #endregion