Такой вот mix из Linq-to-Entities и Linq-to-Objects. Как сделать сабж на VS2010?

using (var entities = new Entities(dbFolder.EfConnStr))
{
    var objItems = new string[] { "a1", "a2", "a3", "a4" };

    var query = from obi in objItems
                where !entities.DbItems.Any(dbi => obi == dbi.Name)
                select obi;

    // Облом
    var sql = ((ObjectQuery)query).ToTraceString(); 
}