Occurs when a notification is received for any of the commands associated with this SqlDependency object.
Assembly: System.Data (in System.Data.dll)
occurs when the results for the associated command change. If you are not using , you can check the HasChanges property to determine whether the query results have changed.
The event does not necessarily imply a change in the data. Other circumstances, such as time-out expired and failure to set the notification request, also generate .