Возврат данных узла XML с помощью C#

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У меня есть следующие XML-результаты, которые генерируются при запуске SOAP-запроса к веб-сервису.

 <?xml version="1.0" encoding="utf-8" ?> 
- <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
- <SOAP-ENV:Body>
- <idc:service xmlns:idc="http://www.stellent.com/IdcService/" IdcService="SEARCH_WORKFLOWS">
- <idc:document dUser="user">
  <idc:field name="SearchAuthor" /> 
  <idc:field name="SearchCID">arf</idc:field> 
  <idc:field name="SearchAssn" /> 
- <idc:resultset name="WfDocuments">
- <idc:row dDocName="ARF16-0711" dID="596213" dDocType="JPS_QMARF" dDocTitle="ARF16-0711 AMYWSA3377 Prop Lbl Prod PV Mat LStatn" dDocAuthor="author" dRevClassID="283640" dRevisionID="1" dRevLabel="A0" dIsCheckedOut="0" dCheckoutUser="" dSecurityGroup="Submitted_Forms" dCreateDate="8/23/16 3:10 PM" dInDate="8/23/16 3:10 PM" dOutDate="" dStatus="REVIEW" dReleaseState="E" dFlag1="" dWebExtension="hcsp" dProcessingState="Y" dMessage="" dDocAccount="" dReleaseDate="" dRendition1="" dRendition2="" dIndexerState="" dPublishType="" dPublishState="">
</idc:row>
  </idc:resultset>
  </idc:document>
  </idc:service>
  </SOAP-ENV:Body>
  </SOAP-ENV:Envelope>

Полная строка вызова SOAP https://auhjpsv01/stellent/idcplg?=SEARCH_WORKFLOWS&амп IdcService;SearchAssn=&ампер;SearchCID=АРФ&амп;SearchAuthor=&ампер;IsSoap=1[^]

Я хочу разобрать данные узла dDocName (ARF16-0711) и данные узла dCreateDate (8/23/16 3:10 вечера) в текстовое поле, но продолжаю получать следующую ошибку с моим кодом.

<soap-env:envelope xmlns:soap-env="http://schemas.xmlsoap.org/soap/envelope/">
<soap-env:body>
<soap-env:fault>
<faultcode>Client</faultcode>
<faultstring>The Soap request is invalid.  The service node '(null)' is invalid.</faultstring>
</soap-env:fault>
</soap-env:body>
</soap-env:envelope>

Что я уже пробовал:

Вот мой код.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Xml;

namespace SOAP_reference
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            setupWebServiceSOAPCall();            
        }

        public void setupWebServiceSOAPCall()
        {
            var _url = "https://auhjpsv01/stellent/idcplg?IdcService=SEARCH_WORKFLOWS&SearchAssn=&SearchCID=arf&SearchAuthor=&IsSoap=1";
            var _action = "https://auhjpsv01/stellent/idcplg?IdcService=SEARCH_WORKFLOWS&SearchAssn=&SearchCID=arf&SearchAuthor=&IsSoap=1";

            XmlDocument soapEnvelopeXml = CreateSOAPXMLEnvelope();
            HttpWebRequest webRequest = CreateSOAPWebRequest(_url, _action);
            InsertSoapEnvelopeIntoWebRequest(soapEnvelopeXml, webRequest);

            // begin async call to web request.
            IAsyncResult asyncResult = webRequest.BeginGetResponse(null, null);

            // suspend this thread until call is complete. You might want to
            // do something usefull here like update your UI.
            asyncResult.AsyncWaitHandle.WaitOne();

            // get the response from the completed web request.
            string soapResult;
            using (WebResponse webResponse = webRequest.EndGetResponse(asyncResult))
            {
                using (StreamReader rd = new StreamReader(webResponse.GetResponseStream()))
                {
                    soapResult = rd.ReadToEnd();
                }
                Console.Write(soapResult);
                textBox1.Text = soapResult;
            } 
        }

        private static HttpWebRequest CreateSOAPWebRequest(string url, string action)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.Headers.Add("SOAPAction", action);
            request.ContentType = "text/xml;charset=\"utf-8\"";
            request.Accept = "text/xml";
            request.Method = "POST";
            return request;
        }

        private static XmlDocument CreateSOAPXMLEnvelope()
        {
            XmlDocument envelop = new XmlDocument();
            envelop.LoadXml(@"<idc:document duser="" gittlera="" xmlns:idc="#unknown"><idc:field name="" searchauthor="" /><idc:field name="" searchcid="">arf</idc:field><idc:field name="" searchassn="" /><idc:resultset name="" wfdocuments=""></idc:resultset></idc:document><soap-env:body xmlns:soap-env="#unknown"></soap-env:body>");
            return envelop;
        }

        private static void InsertSoapEnvelopeIntoWebRequest(XmlDocument soapEnvelopeXml, HttpWebRequest webRequest)
        {
            using (Stream stream = webRequest.GetRequestStream())
            {
                soapEnvelopeXml.Save(stream);
            }
        }
    }
}

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