public StudyHistoryTypeEnumCollection FetchAll()
 {
     var coll = new StudyHistoryTypeEnumCollection();
     var qry = new Query(StudyHistoryTypeEnum.Schema);
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }
 public StudyHistoryTypeEnumCollection FetchByQuery(Query qry)
 {
     var coll = new StudyHistoryTypeEnumCollection();
     coll.LoadAndCloseReader(qry.ExecuteReader());
     return coll;
 }