SOAP Communication C# SoapDocumentMethodAttribute

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C#

webservice

SoapDocumentMethodAttribute("urn: urn:WebService",
                                RequestNamespace = "urn: urn:WebService ",
                                ResponseNamespace = "urn: urn:WebService ",
                                Use = System.Web.Services.Description.SoapBindingUse.Literal,
                                ParameterStyle = System.Web.Services.Protocols.SoapParameterStyle.Wrapped)]
    public string Method (string Parameter)
    {
        NetworkCredential credentials = new NetworkCredential(wsUser, wsPassWord);

        XmlSerializerNamespaces xsn = new XmlSerializerNamespaces();
        xsn.Add("ns0", "urn:Method");

        this.Url = this.Url = "http://";
        this.Credentials = credentials;

        object[] results = this.Invoke("Method", new object[] { Parameter });
        return ((string)(results[0]));
    }

Hello guys, i have a problem with a SOAP Communication, I can access to the web services and everything seems to be working fine, but the client needs a prefix in the XML parameter, so I try
Add these lines:

XmlSerializerNamespaces xsn = new XmlSerializerNamespaces();
       xsn.Add("ns0", "urn:Method");

And hers my first question, how can I see the XML out request I sent to the webservice?
And the second question will be, it’s there a way to add prefix to the send of the web service?

I hope you guys can help me, I am very frustrated with this

Thank you guys.