IIS Express stop process when stop debug in Visual Studio 2013

This is feature in new Visual Studio call "Enable Edit and Continue"
If don't want to close IIS Express go to Project Properties > Web >
to unchecked "Enable Edit and Continue" to let IIS express continue after stop debug.

this setting is default on when create new Project.

System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to

[A]System.Web.WebPages.Razor.Configuration.HostSection cannot be cast to [B]System.Web.WebPages.Razor.Configuration.HostSection. Type A originates from 'System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\WINDOWS\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Razor\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Razor.dll'. Type B originates from 'System.Web.WebPages.Razor, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' in the context 'Default' at location 'C:\Users\xxxx\AppData\Local\Temp\Temporary ASP.NET Files\root\fe4980a2\10ea1996\assembly\dl3\33a3ac9e\f6af08a0_f8d6ce01\System.Web.WebPages.Razor.dll'.

This happen today when I use Nuget upgrade my MVC 4 asp.net 4.5 to last version on 1 November 2013 but can't get my project run normally after upgrade.

Normally look like I got System.Web.Razor version 3.0.0.0 but my web still use version 2.0.0.0 so I try to fix this

first change in root web.config by this

from

    <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>

to

    <appSettings>

        <add key="webpages:Version" value="3.0.0.0" />

        <add key="webpages:Enabled" value="false" />

        <add key="PreserveLoginUrl" value="true" />

        <add key="ClientValidationEnabled" value="true" />

        <add key="UnobtrusiveJavaScriptEnabled" value="true" />

    </appSettings>

from

            <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>

to

            <dependentAssembly>

                <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />

                <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />

            </dependentAssembly>

            <dependentAssembly>

                <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />

                <bindingRedirect oldVersion="1.0.0.0-5.0.0.0" newVersion="5.0.0.0" />

            </dependentAssembly>

            <dependentAssembly>

                <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />

                <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />

            </dependentAssembly>

change in web.config in ~/Views/

    <configSections>

        <sectionGroup name="system.web.webPages.razor" type="System.Web.WebPages.Razor.Configuration.RazorWebSectionGroup, System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">

            <section name="host" type="System.Web.WebPages.Razor.Configuration.HostSection, System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />

            <section name="pages" type="System.Web.WebPages.Razor.Configuration.RazorPagesSection, System.Web.WebPages.Razor, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" requirePermission="false" />

        </sectionGroup>

    </configSections>

to

    <configSections>

        <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">

            <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" />

            <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" />

        </sectionGroup>

    </configSections>

from

        <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />

to

        <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />

from

        <pages

            validateRequest="false"

            pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"

            pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"

            userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35">

            <controls>

                <add assembly="System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" />

            </controls>

        </pages>

to

        <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">

            <controls>

                <add assembly="System.Web.Mvc, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" />

            </controls>

        </pages>

now I can run my project with no problem (for now...)
Update...
yes i can build and run but intellisense not work anymore  look like i need Visual Studio 2003 for this job done.