LINQ not in namespace

Question

I have a web project in visual studio 2012 that I am working with over an ftp connection. I am getting the error that the Linq does not exist in the namespace System.Data and Linq does not exist in the namespace System. Visual studio displays an error and will not give code suggestions, however, the code runs fine on the IIS server.

My web.config contents are below.

I have read over the many questions and articles on this problem and was still unable to find a working solution.

<system.web>
<compilation debug="true" strict="false" explicit="true" urlLinePragmas="true">
  <assemblies>
    <add assembly="System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    <add assembly="System.Web.Abstractions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    <add assembly="System.Windows.Forms, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.ServiceModel.Web, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
    <add assembly="System.Data.Services.Client, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Data.Services.Design, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Data.Entity, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Design, Version=2.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
    <add assembly="System.Xml.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
    <add assembly="System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
  </assemblies>
</compilation>
<pages>
  <namespaces>
    <clear/>
    <add namespace="System"/>
    <add namespace="System.Data.Linq"/>
    <add namespace="System.Linq"/>
    <add namespace="System.Xml.Linq"/>
  </namespaces>
</pages>

Why have you got some version 2.0.0.0 stuff in there. Have you changed the target framework at some point? — Tony Hopkinson
– Tony Hopkinson, Commented Oct 27, 2012 at 17:54

Prabhu Murthy · Accepted Answer · 2012-10-27 17:49:25Z

6

Try to manually add the reference to System.Data.Linq in your project.This should hopefully resolve your problem.

Project -> References -> Add reference -> System.Data.Linq

answered Oct 27, 2012 at 17:49

Prabhu Murthy

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1 Comment

mike9182 Over a year ago

I tried this, however, the web.config file was not changed when the reference was added. I also tried removing the reference from the web.config and then adding it again.

Jay Ridley · Accepted Answer · 2013-04-04 23:37:42Z

2

This comes a little late, but in the interest of "giving back"..... When I had this issue (VS 2010 running website through IIS), I had to change the target framework to something else, save the changes, and then change it back to v 4.0 (the original my project was built with). (Right-click Project -> property pages -> Build -> "Target Framework"). That cleared up the issue. Not sure how or why. =)

answered Apr 4, 2013 at 23:37

Jay Ridley

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Stephen Hewlett · Accepted Answer · 2012-10-27 20:44:46Z

0

In Visual Studio, check that the project is targetted to a version of the .NET framework that includes Linq. Right click on the project, then look for the Target Framework option. If this is set to v2, everything else that VS tells you will be based on v2 - the available assemblies, the versions of the base class library assemblies, etc.

answered Oct 27, 2012 at 20:44

Stephen Hewlett

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3 Comments

mike9182 Over a year ago

The project is targeting .NET 3.5, and all of the required LINQ assemblies are in the GAC.

Stephen Hewlett Over a year ago

I think that is valid - .NET verisons 3 and 3.5 added extra libraries but kept the .NET 2 runtime, so some of the base DLLs will be v2.

Stephen Hewlett Over a year ago

Is there a SupportedRuntime element in the config file?

Ehsan Abidi · Accepted Answer · 2016-01-04 09:55:01Z

0

This happens to me when I upgrade from VisualStudio 2013 to 2015. I encounter to these errors while the Project build doesnot comes to the end and stops after some warnings. I resolve these warnings, and when I solve the last warning: Could not load file or assembly 'Microsoft.ReportViewer.WebForms, Version=11.0.0.0, . . .

the error: the Linq does not exist in the namespace System

get solved.

answered Jan 4, 2016 at 9:55

Ehsan Abidi

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