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