Need to execute web services asynchronously in server side when called by jQuery's .ajax

I have an ASP.NET (3.5) web page which calls a few web methods (SOAP based) using jQuery's .ajax method. The web methods implement 'ScriptMethod' attribute and return JSON data. The web service file (asmx) is local to the same project.

I noticed these web methods execute synchronously on the server which means they run sequentially and affect performance negatively, some methods are waiting, when some of them are slow.

I read this article and I am not sure if I understand that WebMethods which implement Scriptmethod can run synchronously only (they implement IHttpHandler not IH开发者_运维问答ttpAsyncHandler).

If this is true, I might have to change the design.

I am looking for other designs, maybe like using WCF, where the browser can call webmethods using JavaScript and the web methods run asynchronously on the server.

Any ideas or sample code?

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Since you are calling the web service from the browser using the ajax method in jQuery, the call is already asynchronous. You can see this in the $.ajax documentation at http://api.jquery.com/jQuery.ajax/. If you make 3 ajax calls in a row, each will execute at the same time and the callback function will kicked off in first-come first-server basis.

Hopefully I am not misunderstanding your question.

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If you are using WCF you can use the service behavior attribute as follows: [ServiceBehavior(ConcurrencyMode = ConcurrencyMode.Multiple)]

http://msdn.microsoft.com/en-us/library/system.servicemodel.servicebehaviorattribute.concurrencymode.aspx