another way
Editor^ ed = Application::DocumentManager->MdiActiveDocument->Editor;
Database ^pDb = Application::DocumentManager->MdiActiveDocument->Database;
AcDbObjectId ide = *reinterpret_cast<AcDbObjectId*>(&(pDb->CurrentSpaceId));
ed->WriteMessage(pDb->CurrentSpaceId.ToString());
acutPrintf(_T("\n%ld"), ide.asOldId());