Failure To Compile Linq Method In App_Code?

Jan 14, 2010

I've been scratching my head for what seems like ages. I'm sure its really simple to fix but I can't see it.

I have a class in App_Code that uses a bit of Linq.

var siteMap = SiteMapWrapper.BuildSiteMap(true);
var currentTopLevelParent = siteMap.Single(s => s.IsActive);
if (currentTopLevelParent != null)

I've developed this locally and all works fine. When I transfer to IIS hosting the same class fails to compile. I receive:

does not contain a definition for 'Single' and no extension method 'Single' accepting a first argument of type 'SiteMapWrapper' could be found (are you missing a using directive or an assembly reference?)

I confirmed that the virtual dir is running .NET 2.0 as it should. I also confirmed that the correct assemblies are being loaded in the web.config.

<compilation debug="true">
<assemblies>
<add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
<add assembly="System.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
</assemblies>
</compilation>

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