So, I was toying with Ajax recently.
Here's the problem of the day:
When trying to convert VS2005 website to a VS2005 web application with some files having Ajax controls, I ran into this error:
Generation of designer file failed: unknown server tag 'asp:ScriptManager'
Checked web.config, even though for sure I configured ajax correctly, otherwise how was I able to run the VS2005 website without problems?! Sure enough, configured correctly with:
<add tagPrefix="asp" namespace="System.Web.UI" assembly="System.Web.Extensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"/>
However, page still throws error the same error when I tried to convert to web app...
Added System.Web.Extensions to References. Same error.
Googled: found this post:
Didn't fix the problem still!
After puzzling for a bit, I got creative. I copied the old .aspx.designer.cs file over from an old version (before the ajax stuff), added in the controls that I used:
protected System.Web.UI.UpdatePanel UpdatePanel1;
and...viola! Rebuild and error went away! It had nothing to do w/ not recognizing the ScriptManager! How misleading!