Expose a property that allows you to get the user state in the SearchLocationError event arguments (BingRestSearchLocationErrorEventArgs). Currently, only the SearchLocationCompleted event args give this information.

You can work this around using the following approach: You can create a custom BingRestMapProvider and override its OnSearchRequestCompleted() method. There you can get the UserData from the DownloadStringCompletedEventArgs. Check the attached project.