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We have an old ASP.NET MVC 3 Web Application, building in VS2010, that fails to compile, since last week's security update.

The problem is that the reference to System.Web.Mvc.dll is broken.

When I open the solution file on our build machine, where the security update has not run, and open the properties dialog for References->System.Web.MVC, it looks just fine.

Path is C:\Program Files\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies\System.Web.Mvc.dll Version is 3.0.0.0

But when I open the solution file on a dev machine where the security update has run, References->System.Web.MVC is flagged as missing. If I remove it, and try to add it back using VS2010's Add Reference dialog, it doesn't show.

Wandering around the web has led me to suggestions involving updating MVC using NuGet. We didn't use NuGet, in our VS2010 projects, so that doesn't seem quite right, for this situation. I tried it anyway, and ended up with half-a-dozen missing references.

When I look at the properties for "C:\Program Files\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies\System.Web.Mvc.dll" in Windows Explorer, on the build machine I see version 3.0.0.0.

When I look at the properties on the dev machine, I see version 3.0.50813.1.

What I need is a way to change the way I build and run so that I can build and run regardless of which of these two DLLs in installed in the .NET 3.0 framework.

Ideas?

What I have tried that didn't work

First attempt - if the assembly is missing, add it. I deleted the old missing reference. Then I copied the DLL from the "ASP.NET MVC3\Assemblies" folder, into a folder in my project. Set it as "Copy Always", and added it as a reference.

With that, the project would compile in VS2010, but when I'd try to precompile the pages with aspnet_compiler, I got warnings:

(0): warning CS1702: Assuming assembly reference 'System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' matches 'System.Web.Mvc, Version=3.0.0.1, Culture=neutral, PublicKeyToken=31bf3856ad364e35', you may need to supply runtime policy

So far, I've been able to manage to avoid understanding runtime policies, but I tried to add this, in the web.config:

<runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
        <dependentAssembly>
            <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
            <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.1" />
        </dependentAssembly>
    </assemblyBinding>
</runtime>

Tried it again, and got the same warnings.

My question is - do I still have a problem? Or will my resolve it, despite the warnings?

Have you tried updating all nuget packages to their latest version (where possible of course)? – Silvermind Oct 23, 2014 at 19:14 I'm having what looks like the same problem, although I'm using the nuget package and version 4 instead. It compiles fine, and it all works, but there's these 20+ compile warnings I'd like to get rid of. – Farinha Oct 24, 2014 at 12:54

Get the latest version of MVC3 via NuGet. Open your project in Dev Studio. Open the Package Manager Console tab at the bottom of Dev Studio. Then use this command:

PM> Install-Package Microsoft.AspNet.Mvc -Version 3.0.50813.1

If you click the tab key after "-Version" you will get a list of all of the available versions.

If you have an old version of NuGet you may get an error indicating you have to upgrade it. If so, open Tools->Extension Manager to install the latest version of NuGet. Note, you will need to run Dev Studio as Administrator before you can install NuGet.

Installing MVC3 should update Web.config in your project.

<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
  <dependentAssembly>
    <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
    <bindingRedirect oldVersion="0.0.0.0-3.0.0.1" newVersion="3.0.0.1" />
  </dependentAssembly>
</assemblyBinding>
                Badabing!!!! spent hours on this...simple enough to install the version in Nuget pm....thanks a bunch!!!
– J.S. Orris
                Jul 24, 2015 at 16:56
                Yes, Nuget works with Visual Studio 2010.  You just have to install it via Extension Manager. Under the Tools menu.
– 3spot
                Nov 15, 2015 at 17:33
                Install-Package Microsoft.AspNet.Mvc  would fix the issue. We don't really need to mention the version number
– sujay kodamala
                May 17, 2016 at 14:52
                @sujaykodamala Setting the version number matters if you want to install the latest MVC3 and not MVC5 (latest version of the package).
– 3spot
                May 26, 2016 at 20:53
                Install-Package Microsoft.AspNet.Mvc -Project ProjectName -Reinstall is a more explicit, installs the version you have for that project and prevents it from touching other projects (if desired).
– Mike E
                Nov 8, 2016 at 23:33

MVC 5

C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Stack 5\Packages\ Microsoft.AspNet.Mvc.5.0.0\lib\net45\System.Web.Mvc.dll

MVC 4

C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 4\Assemblies\System.Web.Mvc.dll

MVC 3

C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies\System.Web.Mvc.dll

MVC 2

C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 2\Assemblies\System.Web.Mvc.dll

Where can I find System.Web.MVC dll in a system where MVC 3 is installed?

This resolved my issue which arose after I switched to a new PC and had a project with references to the ASP.NET MVC 4 dll's which I had not yet installed on the new machine. – clovola Jun 13, 2018 at 15:04

Just in case someone is a position where he get's the same error. In my case downgrading Microsoft.AspNet.Mvc and then upgrading it again helped. I had this problem after installing Glimpse and removing it. System.Web.Mvc was references wrong somehow, cleaning the solution or rebuilding it didin't worked in my case. Just give it try if none of the above answers works for you.

I have the same situation: Visual Studio 2010, no NuGet installed, and an ASP.NET application using System.Web.Mvc version 3.

What worked for me, was to set each C# project that uses System.Web.Mvc, to go to References in the Solution Explorer, and set properties on System.Web.Mvc, with Copy Local to true, and Specific Version to false - the last one caused the Version field to show the current version on that machine.

Had this problem in vs2017, I already got MVC via nuget but System.Web.Mvc didn't appear in the "Assemblies" list under "Add Reference".

The solution was to select "Extensions" under "Assemblies" in the "Add Reference" dialog.

The sample mvcmusicstore.codeplex.com opened in vs2015 missed some references, one of them System.web.mvc.

The fix for this was to remove it from the references and to add a reference: choose Extentions under Assemblies, there you can find and add System.Web.Mvc.

(The other assemblies I added with the nuget packages.)

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