Basically, all you need to do is Add an AJAX-enabled endpoint to a WCF service

1. Create a BehaviorConfiguration and specify enableWebScript for the behavior.

<behavior name="AspNetAjaxBehavior">
                <enableWebScript />
            </behavior>

2. Create an endpoint that uses that behavior

<endpoint address=""
                behaviorConfiguration="AspNetAjaxBehavior" 
                binding="webHttpBinding"
                contract="Microsoft.Ajax.Samples.ICalculator" />

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