I assume that you are referencing the Crystal-Reports data source window correctly? If so - I think you will never find an ObservableCollection there (and I donโt know if you can watch the CR collection), but in the document class in Crystal-Report you should have something like SetDatasource(I donโt know, t has the most new version, and CR changes it from time to time) - in the latest version I know that in some cases you had to drop IEnumerable<...>( DataTable), so pay attention to this too.
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