Tranctions in nettiers / Tranctions in net tiers

TransactionManager tm = DataRepositor.Provider.CreateTransaction(); 

tm.BeginTransaction();

DataRepositor.Provider.OrderProvider.Save(tm, order);

foreach(OrderDetail detail in order.OrderDetailCollection)

{

  detail.OrderId = order.Id; // get the new order.Id

}

DataRepositor.Provider.OrderDetailProvider.Save(tm,

order.order.OrderDetailCollection);

tm.RollBack();