Both new added objects and updated objects are returned in DirSync search results, from Active Directory server.
How to differentiate them, in SearchResponse?
http://msdn.microsoft.com/en-us/library/system.directoryservices.protocols.searchresponse.aspx
As we know, if an AD objects has been deleted, its attribute 'isDeleted' is marked as TRUE.
Thanks in advance.
I don't know that you can. You may need to cache all of the objectGuids locally and do a lookup to see if the objectGuid is one you don't know about.