Transaction for non database operations

http://www.chinhdo.com/20080825/transactional-file-manager/

http://stackoverflow.com/questions/21094406/where-should-i-perform-action-when-implementing-ienlistmentnotification

http://paxcel.net/blog/extending-transaction-scope-to-non-database-transactions-using-resource-manager/

http://www.codeguru.com/csharp/.net/net_data/sortinganditerating/article.php/c10993/SystemTransactions-Implement-Your-Own-Resource-Manager.htm