As Vladan mentioned, if you want to directly call web services from your client, you need to add the ScriptService() attribute.  If you go to asp.net and Click on 'Learn', and go to the AJAX tutorials, you will find a video that explains exactly how to add the attribute to your web service.

Personally, I would never expose a web service directly from a client.  Instead I would recommend you call a server class, which manages interfaces to your web services.  But if you want to do it, it's explained in the video I mention above.

Hey everyone,

Thanks for the updates. Security is not a consern as this is an intranet and I am authenticating the user against the Active Directory prior to executing the stored procedure within my web method.

Update - I got it all working. Vladan, I want you to know how much I appreciate all your help. Your email ended up putting me on the right track, but it did take me some time to figure out what was happening because my work laptop crashed and my IT dept. had to rebuild my rig. Anyway, I found out the painful way that the WebService and WebMethod can be named anything you want. In the AjaxControlToolkit; however, the arguments must be named exactly what the ASP.NET team uses in their examples.

In the case of the AutoCompleteExtender one must use :

[WebMethod] public string[] AnyNameYouWant(string prefixText, int count) {

// Your DB code here. You must declare the arguments above exactly as they are, whether you use them or not
// in order for this web method to be invoked.

}

I personally copied the Private Members, Constructor, Properties, and Private Methods from my SqlDataProvider class into my web service so I could connect to the database from within the DNN framework.

My config includes :
ASP.NET's AjaxControlToolkit
Microsoft's AJAX 1.0 Release
and Vladan's most exellent work posted in this thread!

For those who doubt this stuff works (for whatever reason), I can tell you that if you stick to the basics, and watch your naming conventions, Ajax will work in DNN provided you follow Vladan's directions to the T.

Cheers!

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Cheers!
John Valentine