Compilation error in .NET 3.5 or C# 3.0

Author Name Status Posted Time Mauritus Sourondakya 5/7/2008 12:31:10 AM Author is Offline Hi friends, I'm clearly missing something: I installed .NET 3.5, which installed fine.  I open an ASPX page and add a .NET 3.5 or C# 3.0 specific feature (such as "var name = 'Tyrven'") and I get a compilation error.  For example, CS0246: The type or namespace name 'var' could not be found  CS0234: The type or namespace name 'Linq' does not exist in the namespace 'System'  Obviously it is still using the CSC.exe that shipped with .NET 2.0 and isn't including references to the new .NET 3.5 class libraries.  I've looked up the fact that .NET 3.0 doesn't show up in the ASP.NET tab in IIS and understand that to be by design - that .NET 3.5 sits on top of .NET 2.0 in much the same way that .NET 3.0 did.  I've seen references to this issue instructing VS2008 users to target .NET 3.5; I don't use the IDE, though.  My assumption is I need to add a <compiler /> element and possibly some assembly references to my web.config or machine.config.  I expected to find documentation on this in the SDK, but didn't.  What step am I missing?

Subject Author Status Date Re: Compilation error in .NET 3.5 or C# 3.0 Seleimon Kolonja 5/7/2008 3:54:49 AM You might consider at least getting the VWD 2008 Express.  It will provide you with a web.config that contains the default settings for ASP.NET 3.5. This is a snippet from the default web.config of a VWD 2008 project: <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= <providerOption name="CompilerVersion" value="v3.5"/> <providerOption name="WarnAsError" value="false"/> </compiler> </compliers> </system.codedom> As for the Linq error, the correct namespace is Sy stem.Xml.Linq. Up to now, the .NET Framework 3.5 documentation has been rolled in with the Windows Server 2008 SDK. The RC version that contains the Beta 2 documentation for .NET 3.5 is currently available.  Post Comments Re: Thanks! Mauritus Sourondakya 5/7/2008 4:02:55 AM That set me in the right direction. Thanks.  There is a System.Linq namespace; it is located in the System.Core.dll assembly.  I added the following to my web.config:    <system.web>       <compilation>       <assemblies>         <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>         <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>       </assemblies>     </compilation>   </system.web>   <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> Post Comments Re: It worked well! Mauritus Sourondakya 5/7/2008 4:03:53 AM Seleimon, It worked with me.  Post Comments

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