I have a simple ASP.NET application I am changing from classic ASP.NET to Infragistic controls.  I am running .NET Framework 4.0, AJAX Control Toolkit 4, and Infragistics for ASP.NET 4.

Default.aspx has a Infragistics datagrid that has several items in it.  You click ona row to select an item.  It posts back gets the two values in the grid to pass to a details web page (Response.Redirect with the parameters on query string). 

The details web page only has a couple of standard ASP.NET controls on it. 

When the details web page loads - it does properly read the parameters passed on the query string. 

But when the details web page (I guess) renders it throws an error:

In Default.aspx [dynamic]

In the lines that read:

<script type="text/javascript">

//<![CDATA[

if (typeof(Sys) === 'undefined') throw new Error(' ASP.NET Ajax client-side framework failed to load.');

//]]>

</script>

The error is:

Microsoft JScript runtime error: ASP.NET Ajax client-side framework failed to load.

Ive tried the other things I can find on the internet regarding this problem. 

Any ideas?

Thanks