What is the correct way to send soap requests using C# (especially to AdvCash servers)?

Question

SOAP

Hello dear friends!
I had never dealt with soap requests before, so they put me in a kind of panic state. I am using this code:

private XmlDocument SendSoap(string xml)
        {
            WebRequest request = WebRequest.Create(WSDL);
            request.ContentType = "text/xml;charset=\"utf-8\"";
            request.Method = "POST";
            string postData = xml;
            StreamWriter sw = new StreamWriter(request.GetRequestStream());
            sw.WriteLine(postData);
            sw.Close();
            WebResponse response = request.GetResponse();
            XmlDocument loaded = new XmlDocument();
            loaded.Load(response.GetResponseStream());
            return loaded;
        }

(WSDL - the link specified in the documentation of the payment system I need )
Compiling the requests themselves is no problem. And how to send them correctly is not clear. The server keeps returning the 500th error. Help, who than can, please!

Answer 1

Usually it's done like this:
Link to the service: https://wallet.advcash.com:8443/wsm/merchantWebSer...
And then it's code :-)

// ServiceReference1 - см. на картинке выше, можно указать любое имя
var client = new ServiceReference1.MerchantWebServiceClient();
// и смотрите какие есть методы в client и что требуется для их использования
// могут быть и другие подводные камни и особенности,
// но свой код взаимодействия писать не придется
// для большинства случаев достаточно будет автоматически созданных классов

Answer 2

I have one problem