XMLHTTP Request to C# Webservice in Javascript passes null parameters

[magister pips]

Hello, I have encountered some strange behaviour when using the
XMLHTTP Request object in Javascript to return xml from a C#
Webservice Method. I create a SOAP envelope and send it off to the
Webservice, which I have debug points in, which when hit I can see
that all the parameters are coming thru as null. I can't figure out
why this is, any experts out there would be a great help.

Here is my Javascript:


function showMsga()
{
if(window.Activ eXObject) {
try {
req = new ActiveXObject(" Msxml2.XMLHTTP" );
}
catch(e) {
try {
req = new
ActiveXObject(" Microsoft.XMLHT TP"); }
catch(e) {
req = false;
}
}
}
else if(window.XmlHt tpRequest) {
try {
req = new XmlHttpRequest( );
}
catch(e) {
req = false;
}
}


var wer = window.location ;

if(req) {
var strEnvelope = "<?xml version=\"1.0\" encoding=\"utf-8\"?>
\n"+
"<soap:Enve lope xmlns:xsi=\" http://www.w3.org/2001/XMLSchema-instance\""
+
" xmlns:xsd=\"htt p://www.w3.org/2001/XMLSchema\""
+
" xmlns:soap= \"http://schemas.xmlsoap .org/soap/envelope/\">
\n" +
"<soap:Body >\n" +
"<MyMethod xmlns=\"https://freedom.org/MyService\">\n" +
"<tpid xsi:type=\"xsd: string\">3083</tpid>\n" +
"<poid xsi:type=\"xsd: string\">1045</poid>\n" +
"</MyMethod>" + "</soap:Body>" + "</soap:Envelope>" ;


req.onreadystat echange = GetMessage;
req.open("POST" ,"http://"+window.locati on.hostname+"/MyService/
Service.asmx",t rue);
req.setrequesth eader("Content-type", "text/xml");
req.setRequestH eader("SOAPActi on","https://freedom.org/MyMethod");
req.send(strEnv elope);



}
}


here is the C# for the WebService method

[WebMethod]
public string MyMethod(string tpid, string poid)
{
int userID = Users2.GetUserI D();

DataProvider dp = DataProvider.In stance();

if(Convert.ToIn t32(poid)>0)
{
return dp.GetPostDetai l(Convert.ToInt 32(poid), userID);
}
else
{
return dp.GetTopicDeta il(Convert.ToIn t32(tpid), userID);
}
}


originally the method took integers but I switched them to strings in
the hope they would work,
any and all comments and hints are greatly appreciated.

Thanks,
Matt