iOS4, wifi connection notification

Question

Hi Everyone,

Using iOS 4, is there a way for a notification to be generated when the devices comes into a wifi zone, and is connected?

My application would like to sit and wait for a notification to be generated that indicates that it is now in a wifi zone and has connected. When the notification is generated, my application would then resume from the suspeneded state, connect to a web service and transmit the information to a web service.

If anyone has any links to a sample, or could provide a simple sample, that would be wondeful.

Thanks tony