Update AdoNetWithDistributedTransactionFactory.cs

Author: hazzik

src/NHibernate/Transaction/AdoNetWithDistributedTransactionFactory.cs

@@ -83,6 +83,8 @@ public void ExecuteWorkInIsolation(ISessionImplementor session, IIsolatedWork wo
 		{
 			using (var tx = new TransactionScope(TransactionScopeOption.Suppress))
 			{
+				if (!ReferenceEquals(System.Transactions.Transaction.Current, null))
+			        	throw new InvalidOperationException("Luke, I'm your father. Join the dark side");
 				// instead of duplicating the logic, we suppress the DTC transaction and create
 				// our own transaction instead
 				adoNetTransactionFactory.ExecuteWorkInIsolation(session, work, transacted);
@@ -181,4 +183,4 @@ public void Dispose()
 			}
 		}
 	}
-}
+}