How Do I Add Property To Http Request In Window Phone

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C#

WPF

SOAP

webservice

, +

Hi guys.
im very new with window phone, and i want to call a webservice with a custom soap header.

my code:

vtputil.UtilSoapClient util = new vtputil.UtilSoapClient();
using (new OperationContextScope(util.InnerChannel))
            {

                // Add a SOAP Header to an outgoing request
                MessageHeader aMessageHeader = MessageHeader.CreateHeader("ServiceAuthHeader", "http://viettelpost.org/", new vtputil.ServiceAuthHeader() { Token = "40872835345345D7A3DBEEC5213062F1" });
                OperationContext.Current.OutgoingMessageHeaders.Add(aMessageHeader);

                util.ListBKCompleted += BindDSBKCompleted;
                util.ListBKAsync("");

            }

use fiddler and i got this

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
   <s:Header>
      <ServiceAuthHeader xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://viettelpost.org/">
         <Token xmlns="http://schemas.datacontract.org/2004/07/PanoramaApp1.vtputil">4087283037AAC3D7A3DBEEC5213062F1</Token>
      </ServiceAuthHeader>
   </s:Header>
   <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <ListBK xmlns="http://viettelpost.org/">
         <FIND/>
      </ListBK>
   </s:Body>
</s:Envelope>

but what i expect is

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" xmlns:viet="http://viettelpost.org/"> 
   <s:Header>
      <ServiceAuthHeader xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://viettelpost.org/">
         <viet:Token xmlns="http://schemas.datacontract.org/2004/07/PanoramaApp1.vtputil">4087283037AAC3D7A3DBEEC5213062F1</viet:Token>
      </ServiceAuthHeader>
   </s:Header>
   <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
      <ListBK xmlns="http://viettelpost.org/">
         <FIND/>
      </ListBK>
   </s:Body>
</s:Envelope>

difference is:

<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/" xmlns:viet="http://viettelpost.org/">

<Token xmlns="http://schemas.datacontract.org/2004/07/PanoramaApp1.vtputil">4087283037AAC3D7A3DBEEC5213062F1</Token>
<viet:Token xmlns="http://schemas.datacontract.org/2004/07/PanoramaApp1.vtputil">4087283037AAC3D7A3DBEEC5213062F1</viet:Token>

please help me T - T!