using (TransactionScope tsFile = new TransactionScope(TransactionScopeOption.Required))
{
   Console.WriteLine("Creating transacted file '{0}'.", filename);

   using (StreamWriter tFile = new StreamWriter(TransactedFile.Open(
          filename, 
          FileMode.Create, 
          FileAccess.Write, 
          FileShare.None)))
   {
      tFile.Write(String.Format("Random data. My filename is '{0}'.", 
          filename));
   }

   tsFile.Complete();
   Console.WriteLine("File '{0}' written.", filename);
}