ClientScript.RegisterStartupScript doesn’t work with ASP.NET AJAX

I frequently place an UpdatePanel around a paged GridView with inline editing.   During OnRowUpdating, the object is saved.   If the save was not successful, I like to show an alert box with the error message.   I recently migrated from the Atlas May CTP to ASP.NET 2.0 AJAX.   The following code …

‘ScriptManager’ is not a known element

I just migrated from the Atlas July CTP to ASP.NET 2.0 AJAX Extensions 1.0.  After following all of the instructions on the AJAX site, my web site still showed tons of errors.  I’m using a Web Site, not Web Application, with a ScriptManager in a WebForm that uses a MasterPage.   …