Soap envelop fefault namespace to be changed in a c# web service

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C#

SOAP

webservice

I have created a hello world apps in c# web service. Below is the soap envelope created.

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:tem="http://tempuri.org/">
   <soapenv:Header/>
   <soapenv:Body>
      <tem:HelloWorld/>
   </soapenv:Body>
</soapenv:Envelope>

How do i change the default schema "
http://schemas.xmlsoap.org/soap/envelope/[^] " I need to use ""http://www.w3.org/2003/05/soap-envelope[^] instead.

I am facing issues with a third party tool having this namespace, without changing the namespace it is not working thats why.

It is bit urgent.Anybody please help.