How to return JSON from a 2.0 asmx web service

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It’s no problem to return JSON from ASMX services in ASP.NET 2.0. You just need the ASP.NET AJAX Extensions installed.

Do be sure to add the [ScriptService] decoration to your web service. That’s what instructs the server side portion of the ASP.NET AJAX framework to return JSON for a properly formed request.

Also, you’ll need to drop the “.d” from “msg.d” in my example, if you’re using it with 2.0. The “.d” is a security feature that came with 3.5.

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