The current version of RadMap (2010.2 924) contains the fix for unhandled exceptions which were raised for Bing services. Could you, please, check the version of DLL you use?
Using this version you can check exceptions from Bing service via the Error property. The short sample code is below.
sender, SearchCompletedEventArgs e)
// Bing Search error has been occured
// error message -- e.Response.Error.Message
// Search response complete
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