C#操作SOAP头信息

Question

用C#将SOAP头信息设置为如下格式
<soapenv:Header>
<ns1:username
soapenv:actor="http://schemas.xmlsoap.org/soap/actor/next"
soapenv:mustUnderstand="0" xsi:type="soapenc:string"
xmlns:ns1="Authorization" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
username
</ns1:username>
<ns2:password
soapenv:actor="http://schemas.xmlsoap.org/soap/actor/next"
soapenv:mustUnderstand="0" xsi:type="soapenc:string"
xmlns:ns2="Authorization" xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/">
password
</ns2:password>
</soapenv:Header>