# getIsNull method

bool getIsNull()

Gets the A value indicating whether if the field is null.

return A value indicating whether if the field is null. throws BiosealException An error has occurred during Bioseal Library execution.

## Implementation

    bool getIsNull() {
      Pointer<Bool> pIsNull = calloc();
      try {
        var err = biosealSDK.id3BiosealField_GetIsNull(_pHandle.value, pIsNull);
        if (err != BiosealError.success.value) {
          throw BiosealException(err);
        }
        final vIsNull = pIsNull.value;
        return vIsNull;
      } finally {
        calloc.free(pIsNull);
      }
    }