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' For complete examples and data files, please go to https://github.com/groupdocs-search/GroupDocs.Search-for-.NET
''' <summary>
''' Event Handler for search options not supported in index
''' </summary>
''' <param name="sender"></param>
''' <param name="e"></param>
Private Shared Sub index_ErrorHappened(sender As Object, e As Search.Events.BaseIndexArg)
    ' e.Message contains corresponding message 
    'if search option is not supported
    'string notificationMessage = e.Message;
    Console.WriteLine(e.Message)
End Sub