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Asked: 2026-05-11T13:03:35+00:00

I added a reference to the System.Core assembly. The web.config now has: <add assembly=System.Core,

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I added a reference to the System.Core assembly. The web.config now has:

<add assembly='System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089'/>

The IIS is set to use ASP.NET version 2.0.50727

Though intellisense shows the extension methods, the compiler does not understand the linq syntax. I can use Linq in other class libraries in the solution.

How do I fix this?

**EDIT: I have the following already in the web.config

<system.web>  <compilation     <assemblies>     <!-- references here //-->     </assemblies>       <compilers>         <compiler language='c#' type='Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089' extension='.cs' compilerOptions='/d:DEBUG;TRACE' />       </compilers>     </compilation> </system.web>

I don’t have the <system.codedom> node. This is a project that has been migrated from 1.x to 2.x to 3.5. Do I remove the <compilers> from the and add it to <system.codedom> ?

Please note that I want to do minimal change necessary to get this to work as this is a large scale Enterprise project (and I dont want to mess with the web.config too much) **

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1 Answer

  1. Just adding the assembly creates a reference, but you have to specify which version of the compiler you are using.

    You need to update the <system.codedom> element in the web.config file:

    <system.codedom>   <compilers>     <compiler language='c#;cs;csharp' extension='.cs' warningLevel='4'       type='Microsoft.CSharp.CSharpCodeProvider, System, Version=2.0.0.0,       Culture=neutral, PublicKeyToken=b77a5c561934e089'>       <providerOption name='CompilerVersion' value='v3.5' />       <providerOption name='WarnAsError' value='false' />     </compiler>   </compilers> </system.codedom>

    The important part you have to make sure is in the <compiler> element is this child element:

    <providerOption name='CompilerVersion' value='v3.5' />

    This makes sure that you are using v3.5 of the C# compiler.

    The <system.codedom> element is a child of the <configuration> element, as per the documentation:

    http://msdn.microsoft.com/en-us/library/k6bttwes.aspx

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