Could not load file or assembly ‘System.Web.Extensions, Version=3.5.0.0

I had myself and my trusted dev friend Surinder stumped on this problem on a recently MS Deployment migration from Windows 2003 (IIS6) to Windos 2008R2 x64.

After tons of google searching and a mixing of a few posts the clue was in the error!

What the problem was that even though the website I moved was .net 2.0 there was a lookup in the web.config:-

‘Could not load file or assembly ‘System.Web.Extensions, Version=3.5.0.0′

I then checked the old server and it had .net 3.5 installed so I installed on the Windows 2008 server by enabling the Feature in Server Manager and voila the website came to life!

 

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