Problem in Visual Studio Professional 2013 after downgrading from Windows 10 to Windows 7

[Pradeep_Singh]

I am using Windows 7 and Visual Studio 13 Professional, Recently I upgraded to windows 10 but I didn't like it so I downgraded to Windows 7. Now an MVC application which was working fine earlier getting an error while debugging. Below is the error is:


Error Description:

Compilation Error


Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: CS0234: The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?)
Source Error:


Line 14: using System.Collections.Generic;
Line 15: using System.IO;
Line 16: using System.Linq;
Line 17: using System.Net;
Line 18: using System.Web;
Source File: c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\ohiadmin\0f8f8cc3\eb0ea4e5\App_Code.hvnte1ez.0.cs Line: 16
Show Detailed Compiler Output:

c:\windows\system32\inetsrv> "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /t:library /utf8output /R:"C:\Windows\Microsoft.Net\assembly\GAC_64\System.Web\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Web.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Mvc\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\Microsoft.VisualStudio.Web.PageInspector.Loader\v4.0_1.0.0.0__b03f5f7f11d50a3a\Microsoft.VisualStudio.Web.PageInspector.Loader.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Abstractions\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Abstractions.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Helpers\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.Helpers.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.WebPages.Deployment\v4.0_2.0.0.0__31bf3856ad364e35\System.Web.WebPages.Deployment.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System\v4.0_4.0.0.0__b77a5c561934e089\System.dll" /R:"C:\Windows\Microsoft.Net\assembly\GAC_MSIL\System.Web.Routing\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Routing.dll" /out:"C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\ohiadmin\0f8f8cc3\eb0ea4e5\App_Code.hvnte1ez.dll" /DEBUG /debug+ /optimize- /w:4 /nowarn:1659;1699;1701;612;618 "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\ohiadmin\0f8f8cc3\eb0ea4e5\App_Code.hvnte1ez.0.cs" "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\ohiadmin\0f8f8cc3\eb0ea4e5\App_Code.hvnte1ez.1.cs"


Microsoft (R) Visual C# Compiler version 4.0.30319.34209

for Microsoft (R) .NET Framework 4.5
Copyright (C) Microsoft Corporation. All rights reserved.

c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\ohiadmin\0f8f8cc3\eb0ea4e5\App_Code.hvnte1ez.0.cs(16,18): error CS0234: The type or namespace name 'Linq' does not exist in the namespace 'System' (are you missing an assembly reference?)
Show Complete Compilation Source: Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.34280


I am using Razor engine and one Helper.cshtml file in APP_Code folder.

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