Issues with ajax controls when upgrading from VS 2005 to VS 2008:
I have developed a website in Visual Studion 2005 (I mean to say DotNet Framework 2.0). I have used ajaxcontroltoolkit and developed ajax enabled website with all the ajax controls (e.g., accordian, asynchronous fileupload, calender extender etc). But I then realized the advantages of DotNet Framework 3.5 , So I just installed VS 2008 and opened my previous project in VS 2008. It asked me to convert to .NET framework 3.5, I just clicked next ->next and completed the conversion.
But then the problem raised with the ajax. Following may be the list of errors you may face when build the project in VS 2008.
A ScriptManager is required on the page to use ASP.NET AJAX Script Components. - error
Unable to cast object of type 'System.Web.Configuration.ScriptingAuthenticationServiceSection' to type 'System.Web.Configuration.ScriptingAuthenticationServiceSection'.
The base class includes the field 'ScriptManager1',