My goal is to get AJAX into Sharepoint and found the the .NET Framework is at 2. So I thought it necessary to update to .NET 4.0. I did a windows update/install and it installed the 4.0. However when I switch(using IIS Manager) from one of the Sharepoint sites from 2 to 4 Sharepoint gives the HTTP Error 404. So I have to switch it back to 2 in order for the site to remain up. What have I done incorrectly?
While I don't think this has anything to do with it...its worth mentioning.
I added AJAX dll to Sharepoints BIN directory.
Added the following to the web.config.
<add assembly="AjaxControlToolkit, Version=188.8.131.52, Culture=neutral, PublicKeyToken=28f01b0e84b6d53e"/>
<add namespace="AjaxControlToolkit" assembly="AjaxControlToolkit" tagPrefix="ajaxToolkit"/>
Please give detailed instructions.