Bind Dropdown use xml, Dropdown fill by xml

  DataSet  ds= new DataSet();
        ds.ReadXml(Server.MapPath("BindXMLToDropDown.xml"));

        DropDownList1.DataSource = ds;
        DropDownList1.DataTextField = "category";
        DropDownList1.DataValueField = "lastUpdated";
        DropDownList1.DataBind();