Could not load file or assembly Temporary ASP.NET Files

If you use Visual Studio Performance Tools then it is possible that Visual Studio left a key in your web.config appsettings section. It causes a 32 bit library to load, which won't work if your application is loading in 64 bit mode.

Check for the following and remove it:

<add key="Microsoft.VisualStudio.Enterprise.AspNetHelper.VsInstrLocation" value="C:\Program Files (x86)\Microsoft Visual Studio 11.0\Team Tools\Performance Tools\vsinstr.exe"/>

One of the solution is to delete those files from temporary asp.net folder that always works for me.

Here you have similar problem I think: Could not load file or assembly 'file:///C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\ asp.net vs2010

accepted answer was:

Try performing a full solution build. If that doesn't work, click Build -> Clean Solution. If the error persists, delete everything in the C:\WINDOWS\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\parktms folder and repeat.

In my case while deploying an ASP.NET MVC project I renamed the DLL of one of the projects (the Assembly Name) in Visual Studio application properties.

Inside the Views folder of the ASP.NET MVC project sits a Web.config file. This Web.config file has the following razor section where we can list assemblies for nice IntelliSense support in Razor view files:

  <system.web.webPages.razor>
    <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
    <pages pageBaseType="System.Web.Mvc.WebViewPage">
      <namespaces>
        <add namespace="VizionLogs.LogRepository" />
        <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" />
      </namespaces>
    </pages>
  </system.web.webPages.razor>

My problem: I renamed the project assembly from VizionLogs.LogRepository to ITVizion.VizionLogs.LogRepository and forgot to rename it in that Web.config file. This was causing that ASP.NET Temp folder error telling me it could not find VizionLogs.LogRepository. It took me some time to figure out what was going on and where the error was... :)

Remove the following lines from web.config will resolve your error.

<compilers>
      <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
      <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
    </compilers>
  </system.codedom>

Go to Registry and enter

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Fusion]
"EnableLog"=dword:00000001
"LogFailures"=dword:00000001
"LogPath"="c:\\temp\\fusionLog"

For loaded assembly you will find a log in c:\temp\fusionLog

There you will find what dependency is missing.

I had same problem. I just solve it by changing on web.config -> system.web -> compilation -> debug="false". Then it work fine

removing temporary projects files in corresponding folder like for .net 4 from below folder will resolve the issue.

"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files"

also refer to this answer.

Answered by Tommy

Please backup and remove the folder myfirst\159977c5\b9e740fc\App_global.asax.yfqtni9g.dll'

Removing contents inside (web.config) block worked for me for a similar issue.

a) Following describe why you should remove it
What exactly does <system.codedom>/<compilers> do in web.config in MVC 5?

Following Additional article from microsoft helps understand the concept

https://docs.microsoft.com/en-us/previous-versions/ms366723(v=vs.140)?redirectedfrom=MSDN

Compilation Folder Location:

By default, when you compile a Web application the compiled code is placed in the Temporary ASP.NET Files folder. This folder is a subdirectory of the location where you installed the .NET framework

Besides this, another article suggested double-checking the targetFramework and framework installed

In my case, I locate the bin folder in web.config as follow :

<appSettings>
      <add key="webSettingFolder" value="C:\Users\ali eshghi\source\repos\SalesWebApiDotNetFramWork\SalesWebApiDotNetFramWork\bin\"/>
  </appSettings>

after that the error has vanished.