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Could not load file or assembly 'AjaxControlToolkit' or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0x80070057 (E_INVALIDARG))

Today while working suddenly my laptop crashed and restarted again. Once laptop restarted, I opened the project in Visual Studio 2012 and tried to run my application, but I got weird Assembly Load Error: Could not load file or assembly...:

Full error read as:
Could not load file or assembly ‘AjaxControlToolkit’ or one of its dependencies. The parameter is incorrect. (Exception from HRESULT: 0×80070057 (E_INVALIDARG))

I tried to clean and rebuild my application, and even closed and re-open visual studio, but still I faced the same error. Even I removed the assembly reference of 'AjaxControlToolkit' and added reference back to my application, but still no luck.

After some research I found out that AjaxControlToolkit assembly corrupted in Temporary ASP.NET Files folder, due to which it is throwing error.

Solution: 
·         Close all instances of Visual Studio. 

·         Delete the Temporary ASP.NET Files, location of these files vary depends of OS you are using,
o   For Windows 7, folder is C:\Windows\Microsoft.NET\Framework\'version folder'\Temporary ASP.NET Files, where 'version folder' depends on ASP.Net version of your application, i.e. in my case folder name is 'v4.0.30319'
o   For Windows Vista, folder is C:\Users\'your user name'\AppData\Local\Temp\Temporary ASP.NET Files, where your user name' is the name of user you are currently logged-in with.
o   For Windows XP, folder is %WINDIR%\Microsoft.NET\Framework\'version folder'\Temporary ASP.NET Files, where 'version folder' depends on ASP.Net version of your application 

·         Once you deleted file, restart the Visual Studio, and you'll see that error is gone.

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