The type or namespace name does not exist in the namespace System Web Mvc

Question

Buiding MVC3 solution went well but have got an error in browser   Compiler Error Message  CS0234  The type or namespace name  Html  does not exist in the namespace  System Web Mvc   are you missing an assembly reference    Source Error  Line 25           lt add namespace  System Web Mvc    gt  Line 26           lt  -- lt add namespace  System Web Mvc Ajax    gt -- gt  Line 27           lt add namespace  System Web Mvc Html    gt  Line 28           lt add namespace  System Web Routing    gt  Line 29           lt add namespace  System Web WebPages    gt    I have installed packets for the solution with NuGet and set up for all projects MVC3  Does MVC3 include libraries System Web Mvc Ajax   System Web Mvc Html and others  Why am I getting the error     In References folder  I have System Web Mvc  Runtime version  v4 0 30319   Version  3 0 0 0     Web config   lt  xml version  1 0  encoding  utf-8   gt   lt  --   For more information on how to configure your ASP NET application  please visit   http   go microsoft com fwlink  LinkId 152368   -- gt   lt configuration gt     lt configSections gt       lt  -- For more information on Entity Framework configuration  visit http   go microsoft com fwlink  LinkID 237468 -- gt       lt section name  entityFramework  type  System Data Entity Internal ConfigFile EntityFrameworkSection  EntityFramework  Version 5 0 0 0  Culture neutral  PublicKeyToken b77a5c561934e089  requirePermission  false    gt     lt  configSections gt     lt appSettings gt       lt add key  aspnet UseTaskFriendlySynchronizationContext  value  true    gt       lt add key  webpages Version  value  1 0 0 0    gt       lt add key  ClientValidationEnabled  value  true    gt       lt add key  UnobtrusiveJavaScriptEnabled  value  true    gt     lt  appSettings gt     lt system web gt       lt compilation debug  true  targetFramework  4 5    gt       lt authentication mode  Forms  gt         lt forms loginUrl    Account LogOn  timeout  2880    gt       lt  authentication gt       lt pages gt         lt namespaces gt           lt add namespace  System Web Helpers    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 add namespace  System Web WebPages    gt         lt  namespaces gt       lt  pages gt       lt httpRuntime targetFramework  4 5  encoderType  System Web Security AntiXss AntiXssEncoder  System Web  Version 4 0 0 0  Culture neutral  PublicKeyToken b03f5f7f11d50a3a    gt       lt machineKey compatibilityMode  Framework45    gt       lt profile defaultProvider  DefaultProfileProvider  gt         lt providers gt           lt add name  DefaultProfileProvider  type  System Web Providers DefaultProfileProvider  System Web Providers  Version 1 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  connectionStringName  DefaultConnection  applicationName       gt         lt  providers gt       lt  profile gt       lt membership defaultProvider  DefaultMembershipProvider  gt         lt providers gt           lt add name  DefaultMembershipProvider  type  System Web Providers DefaultMembershipProvider  System Web Providers  Version 1 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  connectionStringName  DefaultConnection  enablePasswordRetrieval  false  enablePasswordReset  true  requiresQuestionAndAnswer  false  requiresUniqueEmail  false  maxInvalidPasswordAttempts  5  minRequiredPasswordLength  6  minRequiredNonalphanumericCharacters  0  passwordAttemptWindow  10  applicationName       gt         lt  providers gt       lt  membership gt       lt roleManager defaultProvider  DefaultRoleProvider  gt         lt providers gt           lt add name  DefaultRoleProvider  type  System Web Providers DefaultRoleProvider  System Web Providers  Version 1 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  connectionStringName  DefaultConnection  applicationName       gt         lt  providers gt       lt  roleManager gt       lt sessionState mode  InProc  customProvider  DefaultSessionProvider  gt         lt providers gt           lt add name  DefaultSessionProvider  type  System Web Providers DefaultSessionStateProvider  System Web Providers  Version 1 0 0 0  Culture neutral  PublicKeyToken 31bf3856ad364e35  connectionStringName  DefaultConnection    gt         lt  providers gt       lt  sessionState gt     lt  system web gt     lt system webServer gt       lt validation validateIntegratedModeConfiguration  false    gt     lt  system webServer gt     lt runtime gt       lt assemblyBinding xmlns  urn schemas-microsoft-com asm v1  gt         lt dependentAssembly gt           lt assemblyIdentity name  System Web Mvc  publicKeyToken  31bf3856ad364e35    gt           lt bindingRedirect oldVersion  1 0 0 0-2 0 0 0  newVersion  3 0 0 0    gt         lt  dependentAssembly gt       lt  assemblyBinding gt     lt  runtime gt     lt entityFramework gt       lt defaultConnectionFactory type  System Data Entity Infrastructure SqlConnectionFactory  EntityFramework    gt     lt  entityFramework gt     lt connectionStrings gt       lt add name  EFDbContext  connectionString  Data Source   SQLEXPRESS Initial Catalog SportStore Integrated Security True Pooling False   providerName  System Data SqlClient    gt     lt  connectionStrings gt   lt  configuration gt    MSDN the System Web Mvc namespace  file packages config    lt  xml version  1 0  encoding  utf-8   gt   lt packages gt     lt package id  EntityFramework  version  5 0 0-rc    gt     lt package id  jQuery  version  1 7 2    gt     lt package id  jQuery UI Combined  version  1 8 11    gt     lt package id  jQuery Validation  version  1 9    gt     lt package id  Microsoft AspNet Mvc  version  3 0 20105 1    gt     lt package id  Microsoft AspNet Providers Core  version  1 0    gt     lt package id  Microsoft AspNet Providers LocalDB  version  1 0    gt     lt package id  Microsoft AspNet Razor  version  1 0 20105 408    gt     lt package id  Microsoft AspNet WebPages  version  1 0 20105 408    gt     lt package id  Microsoft Web Infrastructure  version  1 0 0 0    gt     lt package id  Modernizr  version  2 0 6    gt     lt package id  Moq  version  4 0 10827    gt     lt package id  Ninject  version  3 0 1 10    gt   lt  packages gt

User · Accepted Answer

Clean your solution and then set the property of those files to Copy Local = True.

To set the Copy Local property to True or False

In Solution Explorer, click the Show All Files button to display the References node.

Open the References node for the project.
Right-click a reference in the References list, and click Properties. The properties associated with that reference appear in a list in the Properties window.
In the Properties window, change the Copy Local property to True or False.

The type or namespace name does not exist in the namespace 'System.Web.Mvc'

The Solution to The type or namespace name does not exist in the namespace 'System.Web.Mvc' is

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