WebService返回XML格式的数据！

1 [WebMethod(Description = "Get All User's Information")]
2     public XmlDocument UserInfo()
3     {
4         DataSet ds = new DataSet();
5         ds = MyConn.GetDataSet("GetAllUser","UserInfo");
6         XmlDocument doc = new XmlDocument();
7         doc = new XmlDataDocument(ds);
8         return doc;
9     }