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ORM_Linq.Articuobject then you might as well make itIQueryable<ORM_Linq.Articu>. Nonetheless, you should follow the approach demonstrated above to capture the result usingSingleOrDefault()to handle it correctly in case the result is null.SqlConnection. I recommend LINQ in Action by Fabrice Marguerie, Steve Eichert and Jim Wooley available here: manning.com/marguerie For C# I suggest Pro C# 2008 and the .NET 3.5 Platform (apress.com/book/view/1590598849) or C# 3.0 in a Nutshell (oreilly.com/catalog/9780596527570) - both these books have new 4.0 editions being released soon.