Select from following answers:- Add <SoapExtension> element in web.config file and set the method attribute to be the name of your web method.
- . Add <SoapExtensionMethod> element to the web.config file that is set to the name of your web method.
- Add a class to your extension that that inherits from the System.Web.Services.Protocols.SoapExtensionAttribute class.

- Add a class to your extension that inherits from the System.Web.Services.Protocols class.
- All Above
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