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Hi every one,

i am new to this site. my first query is:
I am new to vs 2008 and now i am migrating my 2005 project(which is a large project) to 2008. but while building the project i am getting error like :

Could not load file or assembly 'System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' or one of its dependencies. The system cannot find the file specified

even though i set old and new versions in vs 2008 web.config file.

plz,can anyone give the solution to this. sujjest me the steps to migrate this large project

Updated 18-Apr-10 20:16pm

Seems you have installed ASP.NET 2.0 AJAX Extensions 1.0 for using AJAX in .Net framework 2.0.
Have you uninstalled it?
You need to update the reference in the web.config file.
.Net framework 3.5 already has inbuilt support for AJAX. Just update the reference and everything will be fine.
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Ajax framework is not installed on your system.

System.Web.Extensions are the dll's that support Ajax features (like Scriptmanager, Updatepanel,etc). Either provide those dll's in your bin (they are freely available), or can also install the Ajax CTP (this will place those dll's in GAC)

Also, if you are not using AJAX at all.. this dll reference might not be present in VS2005 Web.Config and this reference must be there in VS2008 Web.Config file that you must have created while migration. Just check and remove.
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