public PortfolioCollection FetchAll()
 {
     PortfolioCollection coll = new PortfolioCollection();
     Query qry = new Query(Portfolio.Schema);
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public PortfolioCollection FetchByQuery(Query qry)
 {
     PortfolioCollection coll = new PortfolioCollection();
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }