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This is a simple example of a way to exchange plain text SOAP messages with XML web-service, without the use of OOP wrappers. This code may be refactored by removing the use of XmlDocument and XmlTextWriter classes.

// prepare outgoing SOAP text
XmlDocument doc = new XmlDocument();
doc.LoadXml(soapQuestion);

// prepare web request
Uri uri = new Uri(soapURI);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(uri);
request.Timeout = 100000000;
request.Method = "POST";

// you may need these headers
//req.Headers.Add("SOAPAction", "");
//req.ContentType = "application/soap+xml;charset=\"utf-16\"";
//req.Accept = "application/x-www-form-urlencoded";
//req.Accept = "application/soap+xml"; 

// do request
Stream stream = request.GetRequestStream();
doc.Save(stream);
stream.Close();

// get response
WebResponse response = request.GetResponse();
stream = response.GetResponseStream();
StreamReader reader = new StreamReader(stream);
string result = reader.ReadToEnd();

// process incoming SOAP text
doc = new XmlDocument();
doc.LoadXml(result);
doc.PreserveWhitespace = true;

StringWriter stringwriter = new StringWriter();
XmlTextWriter xmlwriter = new XmlTextWriter(stringwriter);
xmlwriter.Formatting = Formatting.Indented;
doc.WriteTo(xmlwriter);

// result
string soapAnswer = stringwriter.ToString();