Hello everyone,
I imported WS Reference:
https://en-testwebapi.poczta-polska.pl/websrv/en.wsdl
and called it PocztaPolskaTest.
I can connect to it but I have problem with getGuid operation. I don't understand why this operation does not work with parameter value = 1 (as below). I receive an error: "incorrect type of parameter". Why? Operation getGuid has parameter "ilosc" of int type and value 1 is int type, isn't it?
What is wrong and how should I write it? I tried many combinations but none of them works  

ssl = New OpenSSLSecureConnection();
   PocztaPolskaWS = WSReferences.PocztaPolskaTest.CreateWSProxy("http://e-nadawca.poczta-polska.pl","ElektronicznyNadawca","ENSoap",,,ssl,,);       
   PocztaPolskaWS.User = "user";
   PocztaPolskaWS.Password = "pass";

guidstring = PocztaPolskaWS.getGuid(1);  

Dear Kris,

According to the WSDL schema of the web service, the data type of the getGuid method's return value is defined as follows:

<xsd:element name="getGuidResponse">
   <xsd:complexType>
      <xsd:sequence>
         <xsd:element name="guid" type="tns:guidType" maxOccurs="100" minOccurs="1" />
      </xsd:sequence>
   </xsd:complexType>
</xsd:element>