Bind XML to DropDownList ordered

How do I bind a XML-file to a DDL with items ordered in alphabetical order...I can do this to databind it...:

 DataSet ds = new DataSet();
ds.ReadXml(MapPath("XML/file.xml"));


ddl.DataSource = ds;
ddl.DataTextField = "name";
ddl.DataValueField = "value";
ddl.DataBind(); but how do I get the items in order by name ??  ...