Gets a value that indicates whether one of the result sets associated with the dependency has changed.
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If you are not using the SqlDependency.OnChange event, you can check the SqlDependency.HasChanges property to determine if the query results have changed.
The SqlDependency.HasChanges property 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 a change event.