I am trying to test my Sharepoint custom code, using Microsoft.SharePoint.Emulator with VS2012 Premium ( because I have MSDN Premium subscription) I know its officially comes with VS Ultimate version, but somehow I download the dlls : • Microsoft.SharePoint.Emulators • Microsoft.QualityTools.Testing.Fakes • Microsoft.QualityTools.Testing.Emulators When I test my code:

public void TestGetABCInformation()
using (new SharePointEmulationScope())
DataTable dt = new DaoObjects.ABCDAO().GetRequestTriggers();

I got this error I tried a lot but can’t solve this issue.

System.IO.FileNotFoundException: Could not load file or assembly 'System.Web., Version=, Culture=neutral, PublicKeyToken=0ae41878053f6703' or one of its dependencies. The system cannot find the file specified.WRN: Assembly binding logging is turned OFF. To enable assembly bind failure logging, set the registry value [HKLM\Software\Microsoft\Fusion!EnableLog] (DWORD) to 1. Note: There is some performance penalty associated with assembly bind failure logging. To turn this feature off, remove the registry value [HKLM\Software\Microsoft\Fusion!EnableLog]. Kindly share your opinion about it.

  • Try and check the target framework currently selected for the test project? I suspect it is switched to framework 4/4.5. Try to set it back to framework 3.5 and see if that works.
    – SPArcheon
    Commented Feb 5, 2014 at 14:43
  • I tried a lot to switched back to 3.5 but no luck still gets the same error "System.Web." Commented Feb 9, 2014 at 10:28

1 Answer 1


Are you using NuGet Package Manager to install the Emulators package? If so, that's what I did to resolve it:

  1. Change the project's target framework back to 3.5
  2. Remove the Microsoft.CSharp reference from the project
  3. Remove the Microsoft.SharePoint.Emulators package from the project (via NuGet Package Manager)
  4. Re-Add the Microsoft.SharePoint.Emulators package to the project (via NuGet Package Manager)

Et voila, everything works fine again. Hope this helps.

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