protected override bool ExecuteSave()
    {
        //Execute the 'pre-save', 'DefForce/EF save' and 'pre-commit' logic in the same transaction
        using (var tx = new TranscationScope(...))
        {
            //Get all the entities that are being saved
            var savedEntities = EntityManager.FindEntities<Entity>(EntityState.AllButDetached).ToList();

            //Give all the entities a chance to do things before the save
            foreach (var e in savedEntities)
                e.ServerPreSave();

            //Perform the actual save
            var saveSucceeded = base.ExecuteSave();

            //If the save failed, exist immediately
            //   (this will also abort the transaction)
            if (!saveSucceeded)
                return false;

            //Give all the entities a chance to do things after the save
            foreach (var e in savedEntities)
                e.ServerPreCommit();

            //If we've reached this far, everything must have succeeded
            tx.Complete();

            return true;
        }
    }