Gets or sets additional, application-defined information associated with the message.
Assembly: System.Messaging (in System.Messaging.dll)
The property provides for application-defined information, like a large binary object, that is associated with the message. It is the responsibility of the receiving application to interpret the contents of the property.
Where possible, you should include message data in the Body property of the message rather than the property.
When working with foreign queues, use the property to specify message properties that do not exist in Message Queuing.
A foreign queue exists in a queuing system other than Microsoft Message Queuing. Message Queuing communicates with such queues through a connector application.