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SOAP returns XML per definition. There is no other return format. <br />
<br />
So can you rephrase your question? Why JSON?
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SOAP returns XML per definition. There is no other return format.

So can you rephrase your question? Why JSON?

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Excellent answer.<br />
<br />
But look at this site:<br />
How to let an ASMX file output JSON<br />
<a href="http://stackoverflow.com/questions/211348/how-to-let-an-asmx-file-output-json" rel="ugc">http://stackoverflow.com/questions/211348/how-to-let-an-asmx-file-output-json</a>
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Excellent answer.

But look at this site:
How to let an ASMX file output JSON
http://stackoverflow.com/questions/211348/how-to-let-an-asmx-file-output-json [http://stackoverflow.com/questions/211348/how-to-let-an-asmx-file-output-json]

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Since the author commented that my answer is excellent, this question should be closed with my answer as solution.
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Since the author commented that my answer is excellent, this question should be closed with my answer as solution.

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Does the returning json message have to be received by the javascript portion of the client. Client being a C# web application.<br />
<br />
And if the client is a C# windows application, can the json from the &nbsp;soap web service be received by the windows application?
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Does the returning json message have to be received by the javascript portion of the client. Client being a C# web application.

And if the client is a C# windows application, can the json from the  soap web service be received by the windows application?

Returning JSON message from a SOAP Web Service

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

A Web service is a method of communication between two electronic devices over a network. It is a software function provided at a network address over the Web with the service always on as in the concept of utility computing. A web service has an interface described in Web Services Description Language (WSDL). Other systems interact with the Web service in a manner prescribed by its description using SOAP (Simple Object Access Protocol) messages. There are two major classes of Web services: REST-compliant web services, and Arbitrary web services.

Web Services

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).