SOAP Problems with ASP.NET

I am sending the following explicitly using sockets to a ASP.NET service

POST /HelloWorldService/Service1.asmx HTTP/1.1
Content-Type: text/xml; charset=utf-8
SOAPAction: "http://tempuri.org/Add"
Content-Length: 544
Expect: 100-continue
Connection: Keep-Alive
Host: localhost

<?xml version="1.0" encoding="UTF-8"?><SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:types="http://tempuri.org/encodedTypes" xmlns:tns="http://tempuri.org"
SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV
:Body><tns:Add><a xsi:type="xsd:int">70</a><b
xsi:type="xsd:int">89</b></tns:Add></SOAP-ENV:Body></SOAP-ENV:Envelope>


I have been confounded by the response

HTTP/1.1 500 Internal Server Error.
Server: Microsoft-IIS/5.1
Date: Thu, 13 Jun 2002 18:31:58 GMT
Cache-Control: private
Content-Type: text/xml; charset=utf-8
Content-Length: 1103

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <soap:Fault>
      <faultcode>soap:Client</faultcode>
      <faultstring>System.Web.Services.Protocols.SoapException: Server was
unable to read request. ---&gt; System.InvalidOperationException: There is
an error in XML document (1, 435). ---&gt; System.InvalidOperationException:
&lt;Add xmlns='http://tempuri.org'&gt; was not expected.
   at
Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationReader1.Read1_
Add()
   --- End of inner exception stack trace ---
   at System.Xml.Serialization.XmlSerializer.Deserialize(XmlReader
xmlReader)
   at System.Web.Services.Protocols.SoapServerProtocol.ReadParameters()
   --- End of inner exception stack trace ---
   at System.Web.Services.Protocols.SoapServerProtocol.ReadParameters()
   at System.Web.Services.Protocols.WebServiceHandler.Invoke()
   at
System.Web.Services.Protocols.WebServiceHandler.CoreProcessRequest()</faults
tring>
      <detail />
    </soap:Fault>
  </soap:Body>
</soap:Envelope>

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