getting error-could not load file or assembly 'System.Web.Mvc, Version=4.0.0.0

Question

Accidently I had deleted a reference of System.Web.Mvc of version "5.0.0.0" in my web api project,now when I tried to build it,it successfully builds and adds a dll of of System.Web.Mvc of version "4.0.0.0".Now when I run it I got error

Could not load file or assembly 'System.Web.Mvc, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified.

In my web config following lines are written

<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>

When i remove the auto added dll of 'System.Web.Mvc' and adds a dll of 'System.Web.Mvc, Version=5.0.0.0' from my nuget packages 'Microsoft.AspNet.Mvc.5.0.0' error disappears.

My question is from which location i should add my deleted dll or how to restore my accidently deleted dll?

try uninstall and then install Microsoft ASP.NET MVC with nuget — Marian Ban
– Marian Ban, Commented Nov 26, 2014 at 7:12

SBirthare · Accepted Answer · 2014-11-26 07:50:27Z

2

My question is from which location i should add my deleted dll or how to restore my accidently deleted dll?

There are two action here:

If you deleted the dll itself
If you have deleted a reference to the dll

To handle first case, you will have to restore the Nuget package, that's it. For more information on package restore, check this link

To handle second case which you mentioned in your question in very first line, just add a reference to the dll. The dll location is same as where you Nuget package is downloaded.

Hope this helps.

answered Nov 26, 2014 at 7:50

SBirthare

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