SHOW DATA IN COMBOBOX (EXT.NET)

It is little complex to show the data in ext.net combobox  from database . But if you know the way it is soo easy...I am not showing the steps.Try to understand the code...

<div>
        <ext:ResourceManager ID="ResourceManager1" runat="server">
        </ext:ResourceManager>
        <asp:SqlDataSource ID="SqlDataSource1" runat="server"
            ConnectionString="<%$ ConnectionStrings:EMAIL_DBConnectionString %>"
            SelectCommand="SELECT [tx_tempName] FROM [T_TEMPLATE]"></asp:SqlDataSource>
          
    <ext:Store ID="tx_tempName" runat="server" DataSourceID="SqlDataSource1">
        <Reader>
            <ext:JsonReader>
                <Fields>
                    <ext:RecordField Name="tx_tempName" Type="String" Mapping="tx_tempName" />
                </Fields>
            </ext:JsonReader>
        </Reader>
        <SortInfo Field="tx_tempName" Direction="DESC" />
        <Listeners>
            <LoadException Handler="Ext.Msg.alert('Employee Type - Load failed', e.message || e )" />
            <Load Handler="#{cmbEmployeeType}.setValue(#{cmbEmployeeType}.store.getAt(0).get('id'));" />
        </Listeners>
    </ext:Store>
      
    <ext:ComboBox ID="tx_tempNameCombo" StoreID="tx_tempName" runat="server" Width="270"
        Editable="true" DisplayField="tx_tempName" ValueField="tx_tempName"
        TypeAhead="true" Mode="Local" ForceSelection="true" TriggerAction="All" Select="&#111;nfocus=true">
    </ext:ComboBox>
      

    </div>