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c:\Inetpub\wwwroot\columbiagasohio.com\CustomControls\TeachingAids\TeachingAidsList.ascx.cs(150): error CS1061: 'Fahlgren.Sitefinity.Data.TeachingAidOrdersCollection' does not contain a definition for 'TrueForAll' and no extension method 'TrueForAll' accepting a first argument of type 'Fahlgren.Sitefinity.Data.TeachingAidOrdersCollection' could be found (are you missing a using directive or an assembly reference?)