public override void TearDown()
 {
     _reader.Release();
     _chunk.MarkForDeletion();
     _chunk.WaitForDestroy(2000);
     base.TearDown();
 }
 public void td()
 {
     _reader.Release();
     _chunk.MarkForDeletion();
     _chunk.WaitForDestroy(2000);
 }