'ScriptManager' does not exist in the namespace 'System.Web.UI'

's Computer Specifications

When adding ASP.NET AJAX 1.0 ScriptManager and UpdatePanels to some pages in
our Web Application project, we get the following error:

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

This error occurs on the declaration of ScriptManager and UpdatePanel
objects automatically generated in the .designer files. There is no problem
for pages we ported over from ASP.NET 1.1 (where no .designer files exist) -
those compile and work fine. The issue is only with new pages added that
have .designer files. If we comment out the declarations, the web project
compiles fine. Otherwise it reports the above error.

I have added web.extensions assembly to both web.config file and explicitly
as a Reference.

How do we get rid of this error so we don't have to keep manually editing
the .designer files?

Thanks

Thread Tools
Show Printable Version Email this Page
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
type or namespace name 'MessageBox' does not exist in the namespace 'System.Windows' (are you missing an assembly reference?)	mp	Microsoft C# .NET	8	18th Dec 2010 06:55 AM
The type or namespace name 'Generic' does not exist in the class or namespace 'System.Collections'	pantagruel	Microsoft C# .NET	1	23rd Oct 2007 01:07 AM
The type or namespace 'Installer' does not exist in the class or namespace 'System.Configuration'	John Chrisman	Microsoft C# .NET	2	19th Nov 2005 12:24 AM
The type or namespace name 'Windows' does not exist in the class or namespace 'System' (are you missing an assembly reference?)	=?Utf-8?B?UmF5?=	Microsoft Dot NET	1	7th Apr 2004 11:30 PM
Help:Why can't I use namespace System.Web? It is said that this namespace doesn't exist. But it should exist.	Èý¹â	Microsoft ASP .NET	1	29th Jul 2003 06:31 PM