c# - Visual studio intellisense messing up -

so i'm new mvc4 , c#, have been designing website 2 weeks , there have not been issues intelisense.

for 2 days visual studio telling me @viewbag , other @ commands not part of project , may missing or tells me viewbag doesn't exist in current context.

i'm unsure how fix ( have restarted project , machine im working on ) still showing underlined , tells me doesn't exists in context

since i'm still new when / try new code difficult since everything wrong..

example images :

long error can barely read states that

system.web.webpages.html.htmlhelper' not contain definition 'actionlink' .... missing assembly reference ?

i error @codes in razor view aswell exept c# @'s

webconfig file

<?xml version="1.0" encoding="utf-8"?> <!-- more information on how configure asp.net application, please visit http://go.microsoft.com/fwlink/?linkid=169433  --> <configuration> <configsections> <!-- more information on entity framework configuration, visit   http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entityframework, version=5.0.0.0, culture=neutral, publickeytoken=b77a5c561934e089" requirepermission="false" /> </configsections> <connectionstrings> <add name="defaultconnection" connectionstring="server=ane-sql\anesqlserver;database=oilgas;user id=software;password=glvp$102;" providername="system.data.sqlclient" /> </connectionstrings> <appsettings>  <add key="webpages:version" value="2.0.0.0" />  <add key="webpages:enabled" value="false" />  <add key="preserveloginurl" value="true" />  <add key="clientvalidationenabled" value="true" />  <add key="unobtrusivejavascriptenabled" value="true" /> </appsettings> <system.web>  <customerrors mode="remoteonly"></customerrors>   <compilation debug="true" targetframework="4.5" /> <httpruntime targetframework="4.5" /> <authentication mode="forms">   <forms loginurl="~/account/login" timeout="180" /> </authentication> <pages>   <namespaces>     <add namespace="system.web.helpers" />     <add namespace="system.web.mvc" />     <add namespace="system.web.mvc.ajax" />     <add namespace="system.web.mvc.html" />     <add namespace="system.web.optimization" />     <add namespace="system.web.routing" />     <add namespace="system.web.webpages" />   </namespaces> </pages>    </system.web> <system.webserver> <!--<modules runallmanagedmodulesforallrequests="true" />--> <validation validateintegratedmodeconfiguration="false" /> <handlers>   <remove name="extensionlessurlhandler-isapi-4.0_32bit" />   <remove name="extensionlessurlhandler-isapi-4.0_64bit" />   <remove name="extensionlessurlhandler-integrated-4.0" />   <add name="extensionlessurlhandler-isapi-4.0_32bit" path="*."   verb="get,head,post,debug,put,delete,patch,options" modules="isapimodule" scriptprocessor="%windir%\microsoft.net\framework\v4.0.30319\aspnet_isapi.dll" precondition="classicmode,runtimeversionv4.0,bitness32" responsebufferlimit="0" />    <add name="extensionlessurlhandler-isapi-4.0_64bit" path="*." verb="get,head,post,debug,put,delete,patch,options" modules="isapimodule" scriptprocessor="%windir%\microsoft.net\framework64\v4.0.30319\aspnet_isapi.dll"   precondition="classicmode,runtimeversionv4.0,bitness64" responsebufferlimit="0" />   <add name="extensionlessurlhandler-integrated-4.0" path="*."   verb="get,head,post,debug,put,delete,patch,options"    type="system.web.handlers.transferrequesthandler"    precondition="integratedmode,runtimeversionv4.0" />   </handlers>   </system.webserver>   <runtime>   <assemblybinding xmlns="urn:schemas-microsoft-com:asm.v1">   <dependentassembly>     <assemblyidentity name="dotnetopenauth.core" publickeytoken="2780ccd10d57b246" />     <bindingredirect oldversion="1.0.0.0-4.0.0.0" newversion="4.1.0.0" />   </dependentassembly>   <dependentassembly>     <assemblyidentity name="dotnetopenauth.aspnet" publickeytoken="2780ccd10d57b246" />     <bindingredirect oldversion="1.0.0.0-4.0.0.0" newversion="4.1.0.0" />   </dependentassembly>   <dependentassembly>     <assemblyidentity name="system.web.helpers" publickeytoken="31bf3856ad364e35" />     <bindingredirect oldversion="1.0.0.0-2.0.0.0" newversion="2.0.0.0" />   </dependentassembly>   <dependentassembly>     <assemblyidentity name="system.web.mvc" publickeytoken="31bf3856ad364e35" />     <bindingredirect oldversion="1.0.0.0-4.0.0.0" newversion="4.0.0.0" />   </dependentassembly>   <dependentassembly>     <assemblyidentity name="system.web.webpages" publickeytoken="31bf3856ad364e35" />     <bindingredirect oldversion="1.0.0.0-2.0.0.0" newversion="2.0.0.0" />   </dependentassembly>   <dependentassembly>     <assemblyidentity name="webgrease" publickeytoken="31bf3856ad364e35" />     <bindingredirect oldversion="1.0.0.0-1.3.0.0" newversion="1.3.0.0" />     </dependentassembly>     </assemblybinding>    </runtime>     <entityframework>     <defaultconnectionfactory    type="system.data.entity.infrastructure.localdbconnectionfactory, entityframework">   <parameters>     <parameter value="v11.0" />      </parameters>     </defaultconnectionfactory>   </entityframework>     </configuration> 

create new internet web app take out changes ( old code ) insert newly created internet web app config file, add old changes ( skip reading line line see if of messing )

hope helps