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Enabling .NET Framework 3.5 in MOSS/WSS After install
Tuesday, May 5th, 2009
In order to use LINQ and WPF in SharePoint you must have the .NET Framework 3.5 installed, which is a no-brainer. The Microsoft best practices for installing .NET Framework 3.5 is actually to install the framework prior to installing WSS 3.0 or MOSS 2007. In this case, I could not follow best practices as we already had a server in place and re-installing this server was out of the question.
Before you make any of these changes to enable 3.5, please note that any time you modify a web.config file, especially in SharePoint, you should back up everything before you change it. This is not guaranteed to work and is not a supported scenario from Microsoft, so keep that in mind while doing this on a production server.
Enter some custom web.config modifications:
Under the assemblies section in your web.config, add the following two lines:
<add assembly="System.Core, Version=18.104.22.168, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
<add assembly="System.Xml.Linq, Version=22.214.171.124, Culture=neutral, PublicKeyToken=B77A5C561934E089" />
Under the root configuration element, add the following subset of XML:
<compiler language="c#;cs;csharp" extension=".cs" warningLevel="4" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=126.96.36.199, Culture=neutral, PublicKeyToken=b77a5c561934e089">
<providerOption name="CompilerVersion" value="v3.5" />
<providerOption name="WarnAsError" value="false" />
Restart IIS and you should be good to go.
3.5in' Tom Out.
Fixing "Error in loading DLL" in SharePoint
SharePoint Web Services, .NET 3.5, and Authentication Issues
Fixing Access Denied While creating a new page in MOSS/WSS
Adding jQuery to SharePoint
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