Using SQLDependency/SqlNotificationRequest to have multiple instances of the same app receive the same notifications?

I started looking at this recently with the very limited knowledge that the ASP.NET Cache could somehow make use of a SqlCacheDependency to invalidate the cache when a table (or a queries results) change. This lead me to the SQLDependency and SqlNotificationRequest classes. While the details of the SqlNotificationRequest class still elude me I did manage to learn a little about the SQLDependency class. The Start method required greater permissions then I will be able to give the user my process will connect to the database as, so I did some research and successfully created a Queue and Service Broker which my test app was able to use to get notifications.

My problem is that it doesn't work if I run multiple instance of my test app. I've seen little hints here and there that make it sound like I need one setup (Queue, Service Broker, ect..) per instance for this to work which sounds messy and unmaintainable.

Can any one co开发者_高级运维nfirm that this is the case, or maybe even suggest some alternative solutions?

Also, we are running SQL Server 2005.

In case of SQLDependency/SQLNotificationRequest you require separate queue per process. If your different processes listen on the same queue then event notification is not guaranteed. But this is how it is right now.