public static DatasourceHandler GetInstance(Datasource datasource)
 {
     if (_uniqueInstance == null)
     {
         _uniqueInstance = new DatasourceHandler(datasource);
     }
     _datasource = datasource;
     _datasource.LoadPeriods();
     return(_uniqueInstance);
 }
 private DatasourceHandler(Datasource datasource)
 {
     Datasource = datasource;
 }