How to handle optimistic concurrency violations

Hi,
I need to check for optimistic concurrency violations.
I´m trying to implement it using Firebird .NET
Provider 1.6.
I would like to be notified when the local data to be
updated has changed in the remote side while I was
making my edits.
I have read FbTransactionOptions enumeration in
Firebird documentation but it´s not explained yet.
Which options may I use to configurate my provider to
notify me when original data has changed in server
side?

Thanks