Issues while upgrading System.Web.Extensions dll reference from 3.5 to 4.0

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I need to migrate a website built on .net framework 3.5 to 4.0 and it should work fine in IE9

The solution got upgraded by the VS's version utility and the app compiled successfully. We are using Infragistics UltraWebGrid control v11.1 which is giving some script issue when we try to perform scroll or cell edit. The control has got lot of embedded javascript resource files which seems to be not working fine.

I created a poc website of .net framework 4.0 using the same third party dlls and everything works fine. What I can doubt on is the AJAX part. I tried to consume v4.0 of ajaxcontroltoolkit. But the issue what I am facing is, the toolkit internally references System.Web.Extensions.dll of version 4.0 and my application has many references to the dll of v3.5. Adding the reference to v4.0 doesn't replaces the references to v3.5 in the web.config. Finally I manually updated the version info in web.config which has given birth to other errors.

-Unknown server tag 'asp:ScriptManager','asp:UpdatePanel' etc..

-The type or namespace name 'Script' does not exist in the namespace 'System.Web' (are you missing an assembly reference?)

Please give me some suggestions to upgrade the dll references successfully.

Thanks,

Vaishali

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