Hi Simon,
Ajax requests are different from calls to a web service. If you need to make a call to a web service I'd suggest that you use the ScriptManager's PageMethods mechanism. One relevant example you can find at the following link:
http://demos.telerik.com/aspnet-ajax/grid/examples/client/databinding/defaultcs.aspx
All the best,
Tsvetoslav
the Telerik team
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