below method not able to handle concurrency and throwing exception 
(NHibernate.StaleObjectStateException: Row was updated or deleted by 
another transaction)

In hibernate xml i am using <version name="DBVersion" column="DBVersion" 
type="Int64" generated="never" unsaved-value="0"/>

        public void Save(Object o)
        {
            try
            {
                // Check to make sure a session has been started, if not open a 
new session
                if (_session == null)
                    _session = GetSession();

                // Connect to the DB if necessary
                ReconnectDBConnection();
                // Start a transaction
                BeginTransaction();
                // save
                _session.SaveOrUpdate(o);
                // commit
                CommitTransaction();
            }
            catch (NHibernate.StaleStateException e)
            {
                string msg = "DB Stale data error.  Reason: " + e.ToString();
            //show error message
                throw new ExceptionDatabaseStaleData(msg, e);
            }

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