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running a .NET Framework 3.5-based application in .NET Framework 4 getting HTTP Error 500.19 - Internal Server Error

I have assigned a task to debug some issue for a previously build project. When I am running the project in Visual Studio 13 I got below --
Emphasis on this line--
this error is because you are running a .NET Framework 3.5-based
application in .NET Framework 4
I go through this articles--
.net 3.5 application on .net 4.0 runtime
https://learn.microsoft.com/en-us/dotnet/framework/migration-guide/version-compatibility
https://learn.microsoft.com/en-us/dotnet/framework/migration-guide/how-to-configure-an-app-to-support-net-framework-4-or-4-5
Problem with .Net Framework 3.5 applications running in .Net Framework 4
I placed below code in my webconfig configuration section --
<startup>
<supportedRuntime version="v4.0" />
<supportedRuntime version="v2.0.50727" />
</startup>
But nothing changed. According to this article --
https://learn.microsoft.com/en-us/dotnet/framework/install/dotnet-35-windows-10
I enabled .net framework 3.5 in control panel. Still no hope with the same error. Can anyone suggest me how can I get rid of this error or start the project without any problem?
My Web Config is as below:
<?xml version="1.0"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<configSections>
<!-- For 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>
<!--conectionstring is here-->
</connectionStrings>
<startup>
<supportedRuntime version="v4.0"/>
<supportedRuntime version="v2.0.50727"/>
</startup>
<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>
<!--
For a description of web.config changes for .NET 4.5 see http://go.microsoft.com/fwlink/?LinkId=235367.
The following attributes can be set on the <httpRuntime> tag.
<system.Web>
<httpRuntime targetFramework="4.5" />
</system.Web>
-->
<system.web>
<!--<httpRuntime executionTimeout="5000"/>-->
<httpRuntime maxRequestLength="12288"/>
<customErrors mode="Off"/>
<compilation debug="true" targetFramework="4.5">
<assemblies>
<add assembly="System.Data.Entity, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"/>
<add assembly="System.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B03F5F7F11D50A3A"/>
<add assembly="System.Web.Extensions.Design, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
<add assembly="System.Windows.Forms, Version=4.0.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089"/>
</assemblies>
</compilation>
<authentication mode="None"/>
<pages controlRenderingCompatibilityVersion="4.0">
<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>
<profile defaultProvider="DefaultProfileProvider">
<providers>
<add name="DefaultProfileProvider" type="System.Web.Providers.DefaultProfileProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/"/>
</providers>
</profile>
<membership defaultProvider="DefaultMembershipProvider">
<providers>
<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="/"/>
</providers>
</membership>
<roleManager defaultProvider="DefaultRoleProvider">
<providers>
<add name="DefaultRoleProvider" type="System.Web.Providers.DefaultRoleProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/"/>
</providers>
</roleManager>
<sessionState mode="InProc" customProvider="DefaultSessionProvider">
<providers>
<add name="DefaultSessionProvider" type="System.Web.Providers.DefaultSessionStateProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection"/>
</providers>
</sessionState>
</system.web>
<system.webServer>
<!-- For ModSecurity-->
<validation validateIntegratedModeConfiguration="false"/>
<ModSecurity enabled="false" configFile="C:\inetpub\wwwroot\owasp_crs\modsecurity.conf"/>
<!-- For Videos
<staticContent>
<mimeMap fileExtension=".mp4" mimeType="video/mp4"/>
<mimeMap fileExtension=".m4v" mimeType="video/m4v"/>
</staticContent>-->
<!--<validation validateIntegratedModeConfiguration="false" />-->
<modules runAllManagedModulesForAllRequests="true"/>
<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="Newtonsoft.Json" publicKeyToken="30AD4FE6B2A6AEED" culture="neutral"/>
<bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0"/>
</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>
</assemblyBinding>
</runtime>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework"/>
</entityFramework>
</configuration>

After monitoring the web.config file contents, it was found that following line of configuration was causing the error:
<ModSecurity enabled="false" configFile="C:\inetpub\wwwroot\owasp_crs\modsecurity.conf"/>
After commenting out that line of code, the error was fixed.

The error message states that the configuration data is invalid which might have to do with updates to .NET 4.0 as stated on .NET Framework 4 migration issues section of the Migration Guide to the .NET Framework 4.7, 4.6, and 4.5:
Configuration files The root configuration files (the machine.config
file and the root Web.config file) for the .NET Framework and ASP.NET
4 have been updated to include most of the boilerplate configuration
information that was found in the application Web.config files in
ASP.NET 3.5. Because of the complexity of the managed IIS 7 and IIS
7.5 configuration systems, running ASP.NET 3.5 applications under ASP.NET 4 and under IIS 7 and IIS 7.5 can result in either ASP.NET
errors or IIS errors. Upgrade ASP.NET 3.5 applications to ASP.NET 4 by
using the project upgrade tools in Visual Studio 2010. Visual Studio
2010 automatically modifies the ASP.NET 3.5 application's Web.config
file to contain the appropriate settings for ASP.NET 4.
However, you can run ASP.NET 3.5 applications using the .NET Framework
4 without recompilation. In that case, you might have to manually
modify the application's Web.config file before you run the
application under the .NET Framework 4 and under IIS 7 or IIS 7.5. The
specific change you must make depends on the combination of software
you are working with, including Service Pack (SP) releases. For
information about the possible software combinations that are affected
by this change and how to resolve problems with specific combinations,
see the section "Configuration Errors Related to New ASP.NET 4 Root
Configuration" in the document ASP.NET 4 Breaking Changes on the
ASP.NET Web site.
ASP.NET 4 Breaking Changes states two sources of errors:
incorrect merger of machine.config and Web.config
configuration comparison fails due to version numbers not matching
Another option might be to change the order of the framework specification as it will use them in the preferred order from top to bottom as stated in Version Compatibility in the .NET Framework:
So perhaps this will work as well:
<startup>
<supportedRuntime version="v2.0.50727" />
<supportedRuntime version="v4.0" />
</startup>

ASP.NET application restarting for no apparent reason

I know this issue has been brought up a lot, but no matter what I try, it just doesn't seem to solve my issue.
My ASP.NET Web Forms application keeps restarting at what appears to be completely random time intervals, although they seem to normally range between 30 to 60 minutes. I most recently tried to run the application in ServerState instead of InProc, but this did nothing to solve the problem.
There does not seem to be any exceptions thrown, and neither the Error event nor the Shutdown event in Global.aspx are triggered when this happens. Instead, the Application_Start event is suddenly triggered and everything is reset to its initial state.
I read that changing certain files or changing files in critical directories would cause this to happen, but checking the modification date of each file when this occurs shows that not a single file in the application folder has been modified.
I have run the ANTS Memory Profiler to see if there are any memory leaks or other memory related issues that could lay ground to the issue, but memory usage seems completely stable, and never reaches any dramatic levels. At most the memory usage was at about 200 MB, where the CLR and ANTS itself stood for half of the usage. Either way, the issue seems to happen irregardless of the level of memory usage at the specific time.
I am deploying the application to a remote server. I do not have access to the server or any IIS configurations, so there is no way for me to actually adjust or monitor anything myself, although I can of course contact the people running the servers to help me do this. The restarts happen both when I run the application on my local IIS Express and on the remote server, but it does however seem to restart more often on the remote server.
I've added the contents of the Web.config file below. It's located in the root directory.
<configuration>
<appSettings>
<add key="ChartImageHandler" value="storage=file;timeout=20;url=~/VTT/Charts/;"/>
<add key="aspnet:MaxHttpCollectionKeys" value="100000"/>
</appSettings>
<connectionStrings>
<add name="DBConnString" providerName="System.Data.SqlClient"
connectionString="Data Source=(localdb)\MSSQLLocalDB;Initial Catalog=DBC;Connection Timeout=120;Integrated Security=true;Trusted_Connection=true;"/>
</connectionStrings>
<system.web>
<httpHandlers>
<add path="ChartImg.axd" verb="GET,HEAD,POST" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
validate="false" />
</httpHandlers>
<sessionState mode="StateServer" stateConnectionString="tcpip=localhost:42424" cookieless="false" timeout="60"></sessionState>
<compilation debug="true" optimizeCompilations="false" targetFramework="4.5">
<assemblies>
<add assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/>
</assemblies>
</compilation>
<customErrors mode="Off"></customErrors>
<httpRuntime targetFramework="4.5.1" executionTimeout="3600" maxRequestLength="10240"/>
<globalization culture="" uiCulture=""/>
<authentication mode="Windows">
<forms loginUrl="Default.aspx" defaultUrl="Default.aspx" name="adAuthCookie" timeout="60" path="/"/>
</authentication>
<authorization>
<deny users="?"/>
<allow users="*"/>
</authorization>
<pages maintainScrollPositionOnPostBack="true">
<controls>
<add tagPrefix="asp" namespace="System.Web.UI.DataVisualization.Charting"
assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
</controls>
</pages>
</system.web>
<system.webServer>
<defaultDocument enabled="true">
<files>
<clear />
<add value="Default.aspx" />
</files>
</defaultDocument>
<caching>
<profiles>
<add extension=".ico" policy="CacheUntilChange" kernelCachePolicy="CacheUntilChange" />
</profiles>
</caching>
<validation validateIntegratedModeConfiguration="false" />
<handlers>
<remove name="ChartImageHandler" />
<add name="ChartImageHandler" preCondition="integratedMode" verb="GET,HEAD,POST"
path="ChartImg.axd" type="System.Web.UI.DataVisualization.Charting.ChartHttpHandler, System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" />
</handlers>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<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.WebPages" publicKeyToken="31bf3856ad364e35"/>
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0"/>
</dependentAssembly>
</assemblyBinding>
</runtime>
</configuration>
And the Web.Release.config transformation file. (I switched out the connection string parameters for obvious reasons; they are all in order.)
<configuration xmlns:xdt="http://schemas.microsoft.com/XML-Document-Transform">
<connectionStrings>
<add name="DBConnString"
connectionString="Data Source=<server>;Initial Catalog=<cat>;User ID=<userid>;Password=<password>"
xdt:Transform="Replace" xdt:Locator="Match(name)" />
</connectionStrings>
<system.web>
<compilation debug="false" optimizeCompilations="true" xdt:Transform="SetAttributes(debug,optimizeCompilations)" />
</system.web>
</configuration>
Currently this issue is completely ruining my work, and my customer is extremely unhappy with constantly losing work due to application restarts. I'm at a complete loss on what to do. Any suggestions?

Migrating Web Application from Windows Server 2008 to Windows Sever 2016

I am trying to solve a problem for one of my professors at school. He has a C# web project that he is trying to move from a computer running Windows Server 2008 to a newer machine running Windows Server 2016. It is being served with IIS and the students access the application by navigating to the computer's IP address from their own computers.
On the old computer, he simply copied the project folder into C:\inetpub\wwwroot and the application just runs when he navigates to localhost or to his IP address from another computer. However when he copies the project folder into C:\inetpub\wwwroot, the project does not run. Instead,
this is the screen he gets. If you click on the 'autograder' folder (which is the project folder he is trying to host), this HTTP error occurs. The web.config file is located here - C:\inetpub\wwwroot\autograder\Bin\WebApplication1\WebApplication1\web.config
After looking around online for solutions, I have made sure that the wwwroot folder has the required permissions (Web.Config - Cannot read configuration file due to insufficient permissions), but I am not sure why the error says it cannot read the configuration file, nor what is different about Windows Server 2016 that is preventing the project from just running like it did on Windows Server 2008.
Here is the web.config file:
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<!-- add System.Data.Entity.Infrastructure.SqlConnectionFactory -->
<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" providerName="System.Data.SqlClient" connectionString="Data Source=(LocalDb)\v11.0;Initial Catalog=aspnet-WebApplication1-20140618141327;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-WebApplication1-20140618141327.mdf" />
</connectionStrings>
<system.web>
<compilation debug="true" defaultLanguage="c#" targetFramework="4.0" />
<httpRuntime targetFramework="4.0" />
<pages>
<namespaces>
<!--add namespace="System.Web.Optimization" /-->
</namespaces>
<controls>
<add assembly="Microsoft.AspNet.Web.Optimization.WebForms" namespace="Microsoft.AspNet.Web.Optimization.WebForms" tagPrefix="webopt" />
</controls>
</pages>
<authentication mode="Forms">
<forms loginUrl="~/Account/Login" timeout="2880" defaultUrl="~/" />
</authentication>
<profile defaultProvider="DefaultProfileProvider">
<providers>
<add name="DefaultProfileProvider" type="System.Web.Providers.DefaultProfileProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
</providers>
</profile>
<membership defaultProvider="DefaultMembershipProvider">
<providers>
<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="/" />
</providers>
</membership>
<roleManager defaultProvider="DefaultRoleProvider">
<providers>
<add name="DefaultRoleProvider" type="System.Web.Providers.DefaultRoleProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" applicationName="/" />
</providers>
</roleManager>
<!--
If you are deploying to a cloud environment that has multiple web server instances,
you should change session state mode from "InProc" to "Custom". In addition,
change the connection string named "DefaultConnection" to connect to an instance
of SQL Server (including SQL Azure and SQL Compact) instead of to SQL Server Express.
-->
<sessionState mode="InProc" customProvider="DefaultSessionProvider">
<providers>
<add name="DefaultSessionProvider" type="System.Web.Providers.DefaultSessionStateProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" />
</providers>
</sessionState>
</system.web>
<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="0.0.0.0-4.1.0.0" newVersion="4.1.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<system.webServer>
<rewrite>
<rewriteMaps>
<rewriteMap name="start">
</rewriteMap>
</rewriteMaps>
</rewrite>
<defaultDocument>
<files>
<add value="Student.aspx" />
<add value="student" />
</files>
</defaultDocument>
</system.webServer>
</configuration>
I am new to Windows Server, IIS, and web hosting on Windows in general, so I would greatly appreciate any information on why this error is occurring or what changes I may have to make the project to get it to run on Windows Server 2016.

It turns out that the web.config file itself was the problem. I reset the contents of the web.config file and I was able to navigate to the application's home page. After piecing the web.config file back together, I found one set of tags that it didn't like, and that what was why it couldn't read the configuration file properly.

could not load file or assembly HtmAgilityPack verion 1.4.6.0

Ok, i have tried EVERYTHING mentioned on the internet. I have made most of my project in VS 2013 Express for Web. Since it doesn't support Crystal Reports, i reverted to VS2012 Ultimate. It opened the solution just fine and is working as well. The trouble i am having is when i try to add report, it goes past the Naming part, when it is about to load the report page it gives me the following error: ErrorLink.
My Toolkit was working fine on VS2013.
Toolkit version: 7.1213
AjaxMin: 4.97
HtmlAglilityPack: 1.4.9
I am giving my web.config file here:
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=169433
-->
<configuration>
<configSections>
<!-- For 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=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\v11.0;AttachDbFilename=|DataDirectory|\aspnet-SMC-20141224085758.mdf;Initial Catalog=aspnet-SMC-20141224085758;Integrated Security=True" providerName="System.Data.SqlClient" />
<add name="masterConnectionString" connectionString="Data Source=sana\sqlexpress;Initial Catalog=master;Integrated Security=True" providerName="System.Data.SqlClient" />
<add name="SMCConnectionString" connectionString="Data Source=sana\sqlexpress;Initial Catalog=SMC;Integrated Security=True" providerName="System.Data.SqlClient" />
</connectionStrings>
<appSettings>
<add key="ValidationSettings:UnobtrusiveValidationMode" value="None"></add>
</appSettings>
<system.web>
<authentication mode="None" />
<compilation debug="true" targetFramework="4.5" />
<httpRuntime targetFramework="4.5" />
<pages>
<namespaces>
<add namespace="System.Web.Optimization" />
<add namespace="Microsoft.AspNet.Identity" />
</namespaces>
<controls>
<add assembly="Microsoft.AspNet.Web.Optimization.WebForms" namespace="Microsoft.AspNet.Web.Optimization.WebForms" tagPrefix="webopt" />
<add tagPrefix="ajaxToolkit" assembly="AjaxControlToolkit" namespace="AjaxControlToolkit" />
</controls>
</pages>
<membership>
<providers>
<!--
ASP.NET Membership is disabled in this template. Please visit the following link http://go.microsoft.com/fwlink/?LinkId=301889 to learn about the ASP.NET Membership support in this template
-->
<clear />
</providers>
</membership>
<profile>
<providers>
<!--
ASP.NET Membership Profile is disabled in this template. Please visit the following link http://go.microsoft.com/fwlink/?LinkId=301889 to learn about the ASP.NET Membership support in this template
-->
<clear />
</providers>
</profile>
<roleManager>
<!--
ASP.NET Membership Role is disabled in this template. Please visit the following link http://go.microsoft.com/fwlink/?LinkId=301889 to learn about the ASP.NET Membership support in this template
-->
<providers>
<clear />
</providers>
</roleManager>
<!--
If you are deploying to a cloud environment that has multiple web server instances,
you should change session state mode from "InProc" to "Custom". In addition,
change the connection string named "DefaultConnection" to connect to an instance
of SQL Server (including SQL Azure and SQL Compact) instead of to SQL Server Express.
-->
<sessionState mode="InProc" customProvider="DefaultSessionProvider">
<providers>
<add name="DefaultSessionProvider" type="System.Web.Providers.DefaultSessionStateProvider, System.Web.Providers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" connectionStringName="DefaultConnection" />
</providers>
</sessionState>
</system.web>
<system.webServer>
<modules>
<remove name="FormsAuthenticationModule" />
</modules>
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="WebGrease" culture="neutral" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.WindowsAzure.Storage" publicKeyToken="31bf3856ad364e35" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-2.1.0.4" newVersion="2.1.0.4" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="HtmlAgilityPack" publicKeyToken="bd319b19eaf3b43a" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-1.4.9.0" newVersion="1.4.9.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="HtmlAgilityPack" publicKeyToken="bd319b19eaf3b43a" culture="neutral" />
<bindingRedirect oldVersion="1.4.5.0-1.4.6.0" newVersion="1.4.6.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
</configuration>
I rebuilt the solution, cleaned it. I don't know what else to do. Any kind of help will be deeply appreciated.
Error Message:
Could not load file or assembly 'HtmlAgilityPack, Version=1.4.6.0,
Culture=neutral, PublicKeyToken=bd319b19eaf3b43a' or one of its
dependencies. The system cannot find the file specified.

I guess the error is with the version of assembly.
You specify that you work with follow :
HtmlAglilityPack: 1.4.9.0
In your code you have following
<assemblyIdentity name="HtmlAgilityPack" publicKeyToken="bd319b19eaf3b43a" culture="neutral" />
<bindingRedirect oldVersion="1.4.5.0-1.4.6.0" newVersion="1.4.6.0" />
I believe it shouldn't be there since you are using the newer version 1.4.9.0 and you already have that reference. (Which I miss to note on my first try to answer)
<dependentAssembly>
<assemblyIdentity name="HtmlAgilityPack" publicKeyToken="bd319b19eaf3b43a" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-1.4.9.0" newVersion="1.4.9.0" />
</dependentAssembly>

Try this !!
1) Just right click on your Solution
2) Search For AjaxControlToolkit online
3) click on install
4) Restart Visual Studio
5)Build & Run
All The Best

ok, i did alot of searching and thanks to #Caleb and other person for being with me through it all. i uninstalled and reinstalled the different version of CR. It brought up some COM error about some object model lib. I removed the reference and tada.. it's working fine now.
And DO NOT forget to do this:
`When using ADO.NET with the Microsoft .NET Framework
4.0 (and above), the following setting must be added to the application’s configuration file:
<configuration>
<startup useLegacyV2RuntimeActivationPolicy="true">
<supportedRuntime version="v4.0"/>
</startup>
</configuration>`
Hope this helps.

This problem can be arise due to the mismatch of the following dlls included in the project.Either any of the dll/package is missing or not the correct version, so either install or update that package:
AjaxControlToolkit
AjaxMin
HtmlAgilityPack
Tools -> Library Package Manager -> Package Manger Console
PM> install-package [name of the package with correct version]
Example: PM> Install-Package HtmlAgilityPack -Version 1.4.6

Could not load file or assembly 'HtmlAgilityPack, Version=1.4.6.0,
Culture=neutral, PublicKeyToken=bd319b19eaf3b43a' or one of its
dependencies. The system cannot find the file specified
I tried clearing all the temporary files from Temp folder. Just type %Temp% and delete all the files from that folder.
Then cheers my problem was solved.
Note: I tried the following but did not worked:
(i) Rebuilding, restarting, cleaning the solution + projects.
(ii) Referencing with its dll again.
(iii) clearing the data from the path C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files.
(iv) Downloading the missing packages.

Getting Security Exception SQLCE 4, Code First CTP 5 & Shared Hosting

I've been trying to setup a webpage with MVC3 Razor, SQLCE 4 and Code First, the last two downloaded from Nuget, so it is EF Code First CTP5.
I've had a lot of trouble, but I manage to move forward by following this answer
However now I am getting this Security Exception
Description: The application attempted to perform an operation not allowed by the security policy. To grant this application the required permission please contact your system administrator or change the application's trust level in the configuration file.
I thought it should work without full trust so I don't know what is wrong now.
I am using GoDaddy shared hosting with .Net 4 and IIS7
What could be the issue?
EDIT:
I haven't modified the web.config, except for setting custom errors = false to be able to see the exceptions, otherwise I have the webconfig that was generated by using Nuget to get and configure SQLCE and Code first
This is how it is:
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=152368
-->
<configuration>
<appSettings>
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.web>
<customErrors
mode="Off"
/>
<compilation debug="true" targetFramework="4.0">
<assemblies>
<add assembly="System.Web.Abstractions, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Web.Helpers, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Web.Routing, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
<add assembly="System.Web.WebPages, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
</assemblies>
</compilation>
<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.Routing" />
<add namespace="System.Web.WebPages" />
</namespaces>
</pages>
</system.web>
<system.webServer>
<validation validateIntegratedModeConfiguration="false" />
<modules runAllManagedModulesForAllRequests="true" />
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<system.data>
<DbProviderFactories>
<remove invariant="System.Data.SqlServerCe.4.0" />
<add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
</DbProviderFactories>
</system.data>
</configuration>

It seems to be a bug with CTP5 that will be fixed in final release.
http://connect.microsoft.com/VisualStudio/feedback/details/641462/ef-code-first-issue-with-medium-trust

Hmmm as I said in the first comment on the question, it is an error with Code First CTP5, which uses full trust instead of medium trust. Source