Send XML data to Web service

Hi All,

I sending the XML data to webservice but i am getting the error "the remote server returned an error :(500) internal server error"

Below is my code. Please help me to solve this issue.

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


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

        private void Form1_Load(object sender, EventArgs e)
        {
            this.CallWebService();
        }

        public void CallWebService()
        {
            try
            {
                var _url = "https://abc.com/wenox/service.asmx";
                var _action = "https://abc.com/wenox/service.asmx?op=RealTimeTransactionNCPDP";

                XmlDocument soapEnvelopeXml = CreateSoapEnvelope();
                HttpWebRequest webRequest = CreateWebRequest(_url, _action);
                InsertSoapEnvelopeIntoWebRequest(soapEnvelopeXml, webRequest);

                
                IAsyncResult asyncResult = webRequest.BeginGetResponse(null, null);

               
                asyncResult.AsyncWaitHandle.WaitOne();

                
                string soapResult;
                using (WebResponse webResponse = webRequest.EndGetResponse(asyncResult))
                {
                    using (StreamReader rd = new StreamReader(webResponse.GetResponseStream()))
                    {
                        soapResult = rd.ReadToEnd();
                    }
                    Console.Write(soapResult);
                    label1.Text = soapResult.ToString();

                }
            }
            catch(WebException we)
            {
                throw we;
            }
            catch(Exception ex)
            {
                throw ex;
            }
        }

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

        private XmlDocument CreateSoapEnvelope()
        {
            XmlDocument soapEnvelop = new XmlDocument();
            
            soapEnvelop.Load("Patient_Connect_New_RX_23_Dec_2014_13_00_43.xml");
            return soapEnvelop;
        }

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

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thanks in advance