Gets or sets additional, application-specific information.
Assembly: System.Messaging (in System.Messaging.dll)
The message queue is filtered to ignore the property.
The property contains application-specific information that you can use to organize different types of messages. For example, you can use application-specific indexes. It is the responsibility of the application to interpret property information.
Whenever possible, you should include message data in the body of the message rather than the property.
When working with foreign queues, use the Extension property to specify message properties that do not exist in Message Queuing. As with the property, it is the responsibility of the application to understand the content of the Extension property.