IMessageADMessageId Property

Applies to received messages only with DeliveryMode MessageDeliveryMode.PERSISTENT or MessageDeliveryMode.NON_PERSISTENT. Represents the message Id of a Guaranteed message. The message ID is only to be used for the purpose of acknowledgements. No other meaning should be inferred from the value of the message ID. Messages are acknowledged by calling Ack(Int64) If not available 0 is returned.

long ADMessageId { get; }