Get Last Archived Value

Hi,

I am using PISDK.EventPipe to capture the events. When I receive the event for a particular tag, I wish to read last archived value.

Now I am using PIData.ArcValue(TimeStamp, RetrievalTypeConstants.rtAtOrBefore) to read the LastArchive value, but sometime the LastArchived value gets updated/removed from the PIServer.

Is there any other way to capture last Archived value?

Thanks

Shaji