SOAP request namespaces .NET

Question

When my client makes a request via web service, the generated SOAP message looks like this:

<?xml version="1.0" encoding="utf-8"?><soap:Envelope
xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org      
/2001/XMLSchema"><soap:Body><myMethod xmlns="http://mynamespace"&gt;...&lt;/myMethod&gt;&lt;/soap:Body&gt;&lt;/soap:Envelope&gt;

Does anyone know a way to remove the xsi and xsd namespaces when my proxy class makes the request? I'm using .Net framework 1.1.

Thanks