SOAP Webservice met ComplexType consumeren

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Beste leden,

ik heb een vraag over het consumeren van een SOAP service in C#. Ik heb een soap server gemaakt m.b.v. NuSOAP en PHP en wil deze nu in een C# applicatie benaderen.
Als ik een methode (lookupContactPersonString) aanroep welke 1 waarde (xsd:string) teruggeeft dan werkt het goed; roep ik een methode aan met een complexType als resultaat (lookupContactPerson) dan krijg ik de melding "InvalidOperationException" met als InnerException 'When casting from a number, the value must be a number less than infinity'.

Zie hieronder mijn C# code:

private void button1_Click(object sender, EventArgs e)
        {
            string completeName = txtFirstName.Text + " " + txtMiddleName.Text + " " + txtLastName.Text;
            // check if there is enough info to validate
            if (txtCity.Text != "" & ((txtFirstName.Text != "" & txtLastName.Text != "") || (txtFirstName.Text != "" & txtMiddleName.Text != "" & txtLastName.Text != "")) &
                txtCompany.Text != "")
            {
                //string test3 = System.Configuration.ConfigurationSettings.AppSettings["Key3"];
                businessCardScanner service = new businessCardScanner();
                service.Credentials = System.Net.CredentialCache.DefaultCredentials;
                
                contactInformation lookupResult = new CardScanSDKDemo.Services.contactInformation();
                
                lookupResult = service.lookupContactPerson(txtCompany.Text, txtCity.Text, completeName);
                ShowMsg(lookupResult.busRelAccount);
                //ShowMsg(service.lookupContactPersonString(txtCompany.Text, txtCity.Text, completeName));
            }
            // else, warn the user
            else
                ShowMsg("No information to validate");
        }

Dit is mijn WSDL:

<?xml version="1.0" encoding="ISO-8859-1"?>
<definitions xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP-ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:tns="urn:/bi/general/businessCardScanner/lookup.php?wsdl" xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns="http://schemas.xmlsoap.org/wsdl/" targetNamespace="urn:/bi/general/businessCardScanner/lookup.php?wsdl">
<types>
<xsd:schema targetNamespace="urn:/bi/general/businessCardScanner/lookup.php?wsdl"
>
 <xsd:import namespace="http://schemas.xmlsoap.org/soap/encoding/" />
 <xsd:import namespace="http://schemas.xmlsoap.org/wsdl/" />
 <xsd:complexType name="contactInformation">
  <xsd:all>
   <xsd:element name="busRelAccount" type="xsd:string"/>
   <xsd:element name="contactPersonId" type="xsd:string"/>
  </xsd:all>
 </xsd:complexType>
</xsd:schema>
</types>
<message name="lookupContactPersonRequest">
  <part name="busRelName" type="xsd:string" />
  <part name="busRelCity" type="xsd:string" />
  <part name="contactName" type="xsd:string" /></message>
<message name="lookupContactPersonResponse">
  <part name="return" type="tns:contactInformation" /></message>
<message name="lookupContactPersonStringRequest">
  <part name="busRelName" type="xsd:string" />
  <part name="busRelCity" type="xsd:string" />
  <part name="contactName" type="xsd:string" /></message>
<message name="lookupContactPersonStringResponse">
  <part name="return" type="xsd:string" /></message>
<portType name="businessCardScannerPortType">
  <operation name="lookupContactPerson">
    <input message="tns:lookupContactPersonRequest"/>
    <output message="tns:lookupContactPersonResponse"/>
  </operation>
  <operation name="lookupContactPersonString">
    <input message="tns:lookupContactPersonStringRequest"/>
    <output message="tns:lookupContactPersonStringResponse"/>
  </operation>
</portType>
<binding name="businessCardScannerBinding" type="tns:businessCardScannerPortType">
  <soap:binding style="rpc" transport="http://schemas.xmlsoap.org/soap/http"/>
  <operation name="lookupContactPerson">
    <soap:operation soapAction="http://intranet/bi/general/businessCardScanner/lookup.php/lookupContactPerson" style="rpc"/>
    <input><soap:body use="encoded" namespace="" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/></input>
    <output><soap:body use="encoded" namespace="" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/></output>
  </operation>
  <operation name="lookupContactPersonString">
    <soap:operation soapAction="http://intranet/bi/general/businessCardScanner/lookup.php/lookupContactPersonString" style="rpc"/>
    <input><soap:body use="encoded" namespace="" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/></input>
    <output><soap:body use="encoded" namespace="" encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"/></output>
  </operation>
</binding>
<service name="businessCardScanner">
  <port name="businessCardScannerPort" binding="tns:businessCardScannerBinding">
    <soap:address location="http://intranet/bi/general/businessCardScanner/lookup.php"/>
  </port>
</service>
</definitions>

Kan iemand mij helpen en vertellen hoe ik deze methode dan wel aan zou kunnen spreken, zodat ik het complextype kan gebruiken?

Alvast bedankt!
Groeten Sander