https://issues.apache.org/jira/browse/AMQNET-447

Throw an exception the user attempts to create a Durable Subscription that uses individual ack. 
diff --git a/src/main/csharp/Session.cs b/src/main/csharp/Session.cs
index 46257ba..f7c95d1 100755
--- a/src/main/csharp/Session.cs
+++ b/src/main/csharp/Session.cs
@@ -526,6 +526,12 @@
                 throw new InvalidDestinationException("Cannot create a Consumer with a Null destination");
             }
 
+			if (IsIndividualAcknowledge)
+			{
+				throw new NMSException("Cannot create a durable consumer for a session that is using " +
+				                       "Individual Acknowledgement mode.");
+			}
+
             ActiveMQDestination dest = ActiveMQDestination.Transform(destination);
             MessageConsumer consumer = null;