The name ViewBag does not exist in the current context

Question

I am trying to use ViewBag in my application  I have all of the recent dlls  the latest version of MVC 3  but yet I am still getting the Error       The name  ViewBag  does not exist in the current context    I have even uninstalled and then re-installed MVC 3 and yet there is no change    Also  I do not believe that the dll s are showing up in the GAC    What might be my problem  Or how to add the dll s to the GAC

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For MVC5  in case you are building an application from scratch  You need to add a web config file to the Views folder and paste the following code in it    lt  xml version  1 0   gt   lt configuration gt     lt configSections gt       lt sectionGroup name  system web webPages razor  type  System Web WebPages Razor Configuration RazorWebSectionGroup  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  gt         lt section name  host  type  System Web WebPages Razor Configuration HostSection  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt         lt section name  pages  type  System Web WebPages Razor Configuration RazorPagesSection  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt       lt  sectionGroup gt     lt  configSections gt      lt system web webPages razor gt       lt host factoryType  System Web Mvc MvcWebRazorHostFactory  System Web Mvc  Version 5 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt       lt pages pageBaseType  System Web Mvc WebViewPage  gt         lt namespaces gt           lt add namespace  System Web Mvc    gt           lt add namespace  System Web Mvc Ajax    gt           lt add namespace  System Web Mvc Html    gt           lt add namespace  System Web Routing    gt         lt  namespaces gt       lt  pages gt     lt  system web webPages razor gt   lt  configuration gt    Note that for MVC 3 you will have to change version to 3 0 0 0 at    lt host factoryType  System Web Mvc MvcWebRazorHostFactory  System Web Mvc  Version 5 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt    You may have to close and open the   cshtml page again to see the changes

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If you use Visual Studio 2013 and you like use MVC 3  you get this error because Visual Studio 2013 does not support MVC 3 natively  even of you change   Views web config   only MVC 4  https   msdn microsoft com en-us library hh266747 aspx

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I had this problem after changing the Application s Default namespace in the Properties dialog   The   Views Web Config contained a reference to the old namespace

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As  Wilson Vallecilla already mentioned  Please do the below steps to delete the cache   Please follow below path to discover the files   C  Users your name here AppData Local Microsoft VisualStudio 14 0 ComponentModelCache      Delete all four files          Microsoft VisualStudio Default cache   Microsoft VisualStudio Default catalogs   Microsoft VisualStudio Default err   Microsoft VisualStudio Default external      I closed my project  deleted the files on that path and reopened my project  cleaned the solution and built it again and the problem was solved  Deleting your Temporary ASP NET Files also helps  C  Users your name here AppData Local Temp Temporary ASP NET Files   This works for me   Thanks

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I updated webpages Version under  in   Views Web Config folder but this setting was also present in web config in root  Update both or remove from root web config

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I was having the same problem   Turned out I was missing the   Views Web config file  because I created the project from an empty ASP NET application instead of using an ASP NET MVC template   For ASP NET MVC 5  a vanilla   Views Web config file contains the following    lt  xml version  1 0   gt    lt  -- https   stackoverflow com a 19899269 178082 -- gt   lt configuration gt       lt configSections gt           lt sectionGroup name  system web webPages razor  type  System Web WebPages Razor Configuration RazorWebSectionGroup  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  gt               lt section name  host  type  System Web WebPages Razor Configuration HostSection  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt               lt section name  pages  type  System Web WebPages Razor Configuration RazorPagesSection  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt           lt  sectionGroup gt       lt  configSections gt        lt system web webPages razor gt           lt host factoryType  System Web Mvc MvcWebRazorHostFactory  System Web Mvc  Version 5 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35    gt           lt pages pageBaseType  System Web Mvc WebViewPage  gt               lt namespaces gt                   lt add namespace  System Web Mvc    gt                   lt add namespace  System Web Mvc Ajax    gt                   lt add namespace  System Web Mvc Html    gt                   lt add namespace  System Web Routing    gt               lt  namespaces gt           lt  pages gt       lt  system web webPages razor gt        lt appSettings gt           lt add key  webpages Enabled  value  false    gt       lt  appSettings gt        lt system web gt           lt httpHandlers gt               lt add path     verb     type  System Web HttpNotFoundHandler   gt           lt  httpHandlers gt            lt  --                 Enabling request validation in view pages would cause validation to occur                 after the input has already been processed by the controller  By default                 MVC performs request validation before a controller processes the input                  To change this behavior apply the ValidateInputAttribute to a                 controller or action          -- gt           lt pages                 validateRequest  false                  pageParserFilterType  System Web Mvc ViewTypeParserFilter  System Web Mvc  Version 5 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35                  pageBaseType  System Web Mvc ViewPage  System Web Mvc  Version 5 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35                  userControlBaseType  System Web Mvc ViewUserControl  System Web Mvc  Version 5 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  gt               lt controls gt                   lt add assembly  System Web Mvc  Version 5 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  namespace  System Web Mvc  tagPrefix  mvc    gt               lt  controls gt           lt  pages gt       lt  system web gt        lt system webServer gt           lt validation validateIntegratedModeConfiguration  false    gt            lt handlers gt               lt remove name  BlockViewHandler   gt               lt add name  BlockViewHandler  path     verb     preCondition  integratedMode  type  System Web HttpNotFoundHandler    gt           lt  handlers gt       lt  system webServer gt   lt  configuration gt    Adding a   Views Web config file containing this content fixed this problem for me

User · Answer

You need to add the MVC-specific Razor configuration to your web config  See here  Razor HtmlHelper Extensions  or other namespaces for views  Not Found  Use the MVC 3 upgrade tool to automatically ensure you have the right config values

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If you had tried all available answers and still cannot find the answer this might solve issue  If you have different solutions configurations like Debug  Release etc then set project output path to  bin  and compile project  Revert change after compiling     VS looks for dlls in bin folder

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After trying all approaches  none of them worked for me since all I have was correct configurations  finally  Deleting all files from  temp  and   temp   from system  helped to resolve this issue   Open Run command Windows R  and type above strings and delete all temporary files

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I had the same problem and crimbo gave me the right clue  it was caused by the   Views Web config file which was present but not containing the right namespaces I guess     I created a blank MVC5 project and imported its   Views Web config into my existing project and the red waves under every ViewBag use are gone

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Try to Clean and rebuild  It worked in my case

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I had already tried deleting the bin and obj file and restarting VS and had no luck    I ve also had this issue many times and it s a pain to solve each time  Often it is due to the web config file not having the correct version of one of the references  This means click on the reference in Visual Studio to see the version in the property tab  and then match it to the version in the web config files   Another way is  if possible  upgrade to a later version of the  net framework and then deleting bin obj files and restarting Visual Studio  I can only assume it s changing something in the   A quick check of the diff between the csproj file doesn t actually show any major difference    But the differences it did show was  I ve added  remove  to show the old line    lt Project ToolsVersion  4 0  DefaultTargets  Build  xmlns  http   schemas microsoft com developer msbuild 2003  gt   remove   lt Project ToolsVersion  12 0  DefaultTargets  Build  xmlns  http   schemas microsoft com developer msbuild 2003  gt    lt TargetFrameworkVersion gt v4 5 lt  TargetFrameworkVersion gt  remove   lt TargetFrameworkVersion gt v4 6 lt  TargetFrameworkVersion gt    In the Web Config file  not the one in View    lt add key  webpages Version  value  2 0 0 0    gt   remove   lt add key  webpages Version  value  3 0 0 0   gt    It also added  to the same web config file  but I manually removed it    lt system codedom gt       lt compilers gt         lt compiler language  c  cs csharp  extension   cs  type  Microsoft CodeDom Providers DotNetCompilerPlatform CSharpCodeProvider  Microsoft CodeDom Providers DotNetCompilerPlatform  Version 1 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  warningLevel  4  compilerOptions   langversion 6  nowarn 1659 1699 1701   gt         lt compiler language  vb vbs visualbasic vbscript  extension   vb  type  Microsoft CodeDom Providers DotNetCompilerPlatform VBCodeProvider  Microsoft CodeDom Providers DotNetCompilerPlatform  Version 1 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  warningLevel  4  compilerOptions   langversion 14  nowarn 41008  define  MYTYPE   amp quot Web  amp quot   optionInfer    gt       lt  compilers gt     lt  system codedom gt    Finally  in the Package Manager Console  add update-package  Run the website locally and see any compilation errors which was fixed by my second paragraph  matching the versions of the references

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In my case  changing the webpage Version to the proper value resolved my issue  for me the correct value was 2 0 0 0 instead of 3 0 0 0       lt appSettings gt           lt add key  webpages Version  value  2 0 0 0   gt           lt add key  webpages Enabled  value  false   gt

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After trying different things  it turns out it was VS cache  You can resolve it by deleting the cache files located in      C  Users your name here AppData Local Microsoft VisualStudio 14 0 ComponentModelCache   I closed my project  deleted the files on that path and reopened my project  cleaned the solution and built it again and the problem was solved  The files will be recreated when you next launch Visual Studio

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I had the same problem in a solution that had been upgraded to MVC 5 in Visual Studio 2015   In the web config file within the Views folder  not the root web config   I updated the version number referred to in  lt configSections gt  from 2 0 0 0 to 3 0 0 0    lt configuration gt       lt configSections gt         lt sectionGroup name  system web webPages razor  type  System Web WebPages Razor Configuration RazorWebSectionGroup  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  gt           lt section name  host  type  System Web WebPages Razor Configuration HostSection  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt           lt section name  pages  type  System Web WebPages Razor Configuration RazorPagesSection  System Web WebPages Razor  Version 3 0 0 0  Culture neutral  PublicKeyToken 31BF3856AD364E35  requirePermission  false    gt         lt  sectionGroup gt     lt  configSections gt

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I had a   Views Web Config file but this error happened after publishing the site   Turns out the build action property on the file was set to None instead of Content   Changing this to Content allowed publishing to work correctly

[dll] The name 'ViewBag' does not exist in the current context

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