如何将xml文件加载到asp.net的dropdownlist中

the file looks like this:

该文件如下所示:

    <?xml version="1.0" encoding="utf-8" ?>
    <data>
    <a7190>
    <food>Almond</food>
    <food>American Cheese</food>
    <food>Apple</food>
    </a7190>
    <a7191>
    <food>Trout</food>
    <food>Tuna</food>
</a7191>
    <food>Turkey</food>
    <food>Wheat</food>
<a7193>
    <food>Yogurt</food>
    </a7193>
    </data>
    <?xm