How to query an Xml Document using a SP and populate an ASP DropDownList from code-behind?

Given the xml:

鉴于xml:

<?xml version="1.0" encoding="UTF-8"?>
<root>
    <lfSpec1ForLoc>
        <a href="/go.html?url=/spec.aspx?id=20" title="AI">AI</a>
    </lfSpec1ForLoc>
    <lfSpec2ForLoc />
    <lfSpec3ForLoc />
    <lfSpec4ForLoc />
    <lfSpec5ForLoc />
    <lfSpec6ForLoc />
    <lfSpec7ForLoc />
    <lfSpec8ForLoc />
    <lfSpec9ForLoc />
    <lfSpec10ForLoc />
</root>
<?xml version="1.0" e