Where can I find System.Web.Helpers, System.Web.WebPages, and System.Web.Razor?

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I am following this article on RazorGenerator and it say's that I must add references to:

System.Web.Helpers.dll
System.Web.WebPages.dll
System.Web.Razor.dll

The only one I can see when I do Add Reference is System.Web.Razor, but I don't know where the other ones are.

Brussels answered 7/11, 2011 at 14:34 Comment(1)

Possible duplicate question: System.Web.Helpers not found in VS2015 – Moonraker 24/7, 2018 at 13:43

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You will find these assemblies in the Extensions group under Assemblies in Visual Studio 2010, 2012 & 2013 (Reference Manager)

Saxophone answered 17/1, 2013 at 13:57 Comment(3)

I believe question says in Visual Studio 2010 (look at the tags) – Cogwheel 5/2, 2015 at 15:38

Nope, I didn't find these assemblies in the Extensions (VS 2015, MVC 4, .NET 4.5.2) – Crimp 16/6, 2016 at 5:9

I think they are part of Microsoft.AspNet.WebPages (which is dependent on Microsoft.AspNet.Razor which is also needed for some of these namespaces) today. – Dorcy 5/4, 2017 at 6:59

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To sum up all of the options for VS 2017, WebHelpers was installed by installing MVC in previous versions of Visual Studio. If you're getting this error, you probably don't have the older versions of VS installed anymore.

So, installing the Microsoft.AspNet.MVC NuGet package will require Microsoft.AspNet.WebPages and Microsoft.AspNet.Razor, and the Microsoft.AspNet.WebPages includes System.Web.Helpers.dll.

If you've got direct references to System.Web.Mvc.dll and you don't want to use NuGet for MVC, you can get the Microsoft.AspNet.WebPages NuGet, or there are some other NuGet packages that only contain System.Web.Helpers.dll, like the microsoft-web-helpers or System-Web-Helpers.dllpackages.

There appear to be 2 versions of System.Web.Helpers.dll, one for .Net 4.0 and one for 4.5. Choosing the correct version of MVC or AspNet.WebPages will ensure you get the right one.

Valeriavalerian answered 11/1, 2018 at 15:21 Comment(1)

System.Web.Helpers.dll in the System-Web-Helpers.dll nuget package is the latest and works with VS 2017. Contains just the System.Web.Helpers.dll. That's all. – Buine 16/3, 2021 at 15:27

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As for VS2017 I didn't find it in "extensions", there's a Nuget package called "microsoft-web-helpers" that seems to be equivalent to System.Web.Helpers.

Vocalise answered 6/6, 2017 at 18:47 Comment(0)

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I had the same problem , first I couldn't find those dlls in the list of .NET components . but later I figured it out that the solution is :

1- first I changed target framework from .NET framework 4 client profile to .NET framework 4.

2- then scroll down the list of .NET components , pass first list of system.web... , scroll down , and find the second list of system.web... at the bottom , they're there .

I hope this could help others

Hairdresser answered 4/11, 2012 at 10:29 Comment(2)

In Visual Studio 2012, look in the Extensions filter on the left hand-side, as per comment below - in case you don't read that far (as I did not). – Striation 26/4, 2013 at 16:27

What do you mean by pass the firs list? there is only one list and can be sorted with component name! what is the name you are referring to? to see those DLL's MVC3 should be installed and it won't install if you don't have IIS in your computer – Cogwheel 5/2, 2015 at 15:17

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In VS 2010 just right click on project or on reference and click add reference. On the popup window Select Assemblies - > Extensions -> System.Web.Helpers

Forfeit answered 12/2, 2014 at 11:12 Comment(3)

Visual studio 2010 does not have Select Assemblies or Extensions or ... You are referring to Visual Studio 2012 and above – Cogwheel 5/2, 2015 at 15:39

For VS 2010 select project References->add Reference->.NET tab-> click Component Name to organize list->should see system.web.helpers.. – Numerate 14/12, 2015 at 23:1

System.Web.Helpers does not exist under Select Assemblies - > Extensions – Posthaste 13/11, 2017 at 16:22

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Installing ASP.NET MVC3 from here should help.

Manvell answered 7/11, 2011 at 14:45 Comment(2)

I don't think MVC3 will help. Here are my references of a MVC3 project: i.imgur.com/414j8.png. I don't have them either. – Warder 7/11, 2011 at 14:50

Thanks, this was the root cause of the issue for me. – Southsoutheast 19/12, 2014 at 1:42

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This particular NuGet package has a habit of losing its references in one of our projects. From time to time I will need to run the following command in the Package Manager Console to restore the references and everything is OK again

Update-Package Microsoft.AspNet.Webpages -reinstall

Zindman answered 11/9, 2019 at 18:53 Comment(0)

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On VS2017 I installed the NuGet package: Microsoft.AspNet.WebPages

That did the trick.

Renitarenitent answered 26/10, 2017 at 18:33 Comment(0)

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I had to install RazorGenerator.Templating to get it all to work. From the NuGet console, type:

Install-Package RazorGenerator.Templating

Brussels answered 7/11, 2011 at 16:11 Comment(0)

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They should be under C:\Program Files\Microsoft ASP.Net (or C:\Program Files (x86)\Microsoft ASP.Net if you're on a 64-bit OS) in a subfolder for MVC3 or WebPages.

Homager answered 7/11, 2011 at 20:4 Comment(0)

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The issue is a missing or outdated version of MVC. I was running VS 2015Preview and could resolve the issue by installing the latest version of MVC via NuGet.

Just in case anyone is still coming across this one.

Figurine answered 23/2, 2015 at 20:44 Comment(0)

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When you install this nuget package Microsoft.AspNet.WebPages they can be find in C:\Program Files (x86)\Microsoft Visual Studio\Shared\Packages\Microsoft.AspNet.WebPages.x.x.x\lib\net45

Rosabella answered 8/3, 2019 at 11:14 Comment(0)

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