public AuthorizedDataReaderExtension(DataReader dataReader, string key, IDataReaderExtension next)
 {
     _key = key;
     Next = next;
     _dataReader = dataReader;
 }
 public MonitoredDataReaderExtension(DataReader dataReader, IDataReaderExtension next)
 {
     _dataReader = dataReader;
     Next = next;
 }