Asynchronous notifications using WithEvents in Visual Basic can be a powerful feature. The idea of running code only in response to an event is quite attractive. However, note the following:

• Events can get lost, and you should periodically reenable notification.
• Multiple clients will be notified in the event of a single message. This problem is common; the application ceases to respond to user input. To fix this, ensure that all subsequent receives have timeouts set for the MQReceiveMessage function.