public void removeDataSource(string DataID)
 {
     DI_DAO dao = null;
     try
     {
         dao = new DI_DAO();
         dao.beginTransaction();
         dao.removeDataSource(DataID);
         dao.removeTableSource(DataID);
         dao.commitTransaction();
     }
     catch (Exception ex)
     {
         dao.rollbackTransaction();
         throw ex;
     }
 }