ASP.NET binding to DataReader

I have a large collection of DAL code that returns lists of entities
(List<entity>) for general binding operations usually to a GridView via an
ObjectDataSource.

I think about binding directly to a SqlDataReader but how do I insure that
the Reader and its associated Connection both get closed? I would like to
continue using ObjectDataSources and am pretty sure I can pass a reader back
through this guy.

Thanks,

Andy

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