I can compile and test my .NET 4.0 web application just fine within Visual Studio 2010. If, however I point my local IIS to the folder containing the application, I get the following error:
Compiler Error Message: CS0234: The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?)
Source Error:
Line 388: <add namespace="System.ComponentModel.DataAnnotations" />
Line 389: <add namespace="System.Configuration" />
Line 390: <add namespace="System.Linq" />
Line 391: <add namespace="System.Text" />
Line 392: <add namespace="System.Text.RegularExpressions" />
Source File: c:\Windows\Microsoft.NET\Framework\v4.0.30319\Config\web.config Line: 390
How is it that the web.config from the framework won't compile for me?
I have found similar problems on the web and most just say 'add this reference...', but it can't be the right thing to edit the default web.config -- can it?