Serialize all elements with namespace prefix

[Don]

I am calling a web service that requires all elements to have a namespace (or
alias) prefix before all elements. Here is an example of xml that works
correctly:

<SOAP-ENV:Body>
<m:VINValidatio nRequest xmlns:m="http://...">
<m:requestHeade r>
<m:RequestingAp plicationCd>Tes t</m:requestingApp licationCd>
</m:requestHeader >
</m:VINValidation Request>
</SOAP-ENV:Body>

The xml stream that gets generated from my .Net call to the web method does
not contain the namespace prefix though (the m: is omitted).

<SOAP-ENV:Body>
<VINValidationR equest xmlns="http://...">
<requestHeade r>
<RequestingAppl icationCd>Test</requestingAppli cationCd>
</requestHeader>
</VINValidationRe quest>
</SOAP-ENV:Body>

Can someone tell me how to get this namespace in each element when the .Net
serialization function is invoked?

Thank you