Problem compileing using linq

[Mike Pliam]

Including:

using System.Linq;
using System.Xml.Linq;

on an *.aspx.cs web page is standard in a C# ASP.NET website page generated by VS 2008. But if I port that page to my server, there occurs a compiler error when I try to access that page via the Internet (IE 8). Once the 'Linq' statements are commented out, the page works just fine.

One thing I notice. The Web.config file on the local VS 2008 generated ASP.NET Website contains the following

          <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.Data.DataSetExtensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
            <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
          </assemblies>

whereas my server based Web.config file does not contain the 'System.Xml.Linq' assembly. Could that be the problem?