Web Service AuthenticationHeader VB.net - PHP

Hi, new here at Experts Exchange, I'm about to build an API in VB.NET which is called from a PHP page.

I got HelloWorld() work. But GetData() is not working!  Can't see any Error message.

My point of this question is how do I enter information in SoapHeader with "Service1.asmx?WSDL?&UserID=AdminPassword=Admin" And then use this to keep track of user?

========= VB.NET CODE ========= 
Public Class Service1
    Inherits System.Web.Services.WebService
 
    'class that inherits from SoapHeader
    Public Class MyHeader
        Inherits SoapHeader
        Public UserID As String
        Public Password As String
    End Class
 
    'instance of soap header class
    'this will be populated by client and send back
 
    Public objMyHeader As MyHeader
 
    'set soap header details
 
    <WebMethod(), SoapHeader("objMyHeader", direction:=SoapHeaderDirection.InOut)> Public Function GetData() As String
        If objMyHeader.UserID = "Admin" And objMyHeader.Password = "Admin" Then
            Return "Valid user"
            ''Call your second method here
        Else
            Return "Invalid user"
        End If
    End Function
 
    <WebMethod()> Public Function HelloWorld() As String
        Return "Hello World"
    End Function
End Class
 
========= PHP CODE ========= 
<?php
try {
	$serviceUrl = "http://localhost:53719/Service1.asmx";
	
	$client = new SoapClient($serviceUrl . "?WSDL",
	array("location" => $serviceUrl . 
	"?UserID=Admin&Password=Admin"));
	$objectresult = $client->GetData();
 
} catch(SoapFault $soapFault) {
	echo "Error: " . $soapFault->faultstring;
}
?>
 
========= SOAP CODE ========= 
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Header>
    <MyHeader xmlns="http://tempuri.org/">
      <UserID>string</UserID>
      <Password>string</Password>
    </MyHeader>
  </soap:Header>
  <soap:Body>
    <GetData xmlns="http://tempuri.org/" />
  </soap:Body>
</soap:Envelope>

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