Bind Xml DataSource to Dropdownlist

place.xml
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<?xml version="1.0" encoding="utf-8" ?>
<Places>
  <Place>
    <Id> 1 </Id>
    <City>Chennai</City>
    <Country>INDIA </Country>
  </Place>
  <Place>
    <Id> 2 </Id>
    <City> Atlanta </City>
    <Country>USA </Country>
  </Place>
</Places>
In Codebehind of the page,place this code
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protected void Page_Load(object sender, EventArgs e)
    {
        DataSet DS = new DataSet();
        DS.ReadXml(Server.MapPath("~/place.xml"));
        DropDownList1.DataTextField = "City";
        DropDownList1.DataValueField = "Id";
        DropDownList1.DataSource = DS;
        DropDownList1.DataBind(); 
    }