How to get a xml response from a web service using soap/xml request in asp.net?

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C#

ASP.NET

Hello everyone i am converting one classic asp legacy application into .net I am stuck at this point where i need to call a webservice located at a url. I am able to do this by adding a web reference but the response that i am getting is a string.I need an xml so that i can bind that into a grid. so when i am using this code

  public  void Execute()
     {
    var url ="http://sun2205.daytonoh.ncr.com:7780/NCROMeOrderInterfaceApl-
     NCROMeOrderInterfaceproj-context-root/NCROMeOrderInterfaceWSSoapHttpPort";    
    HttpWebRequest request = CreateWebRequest(url);
    XmlDocument soapEnvelopeXml = new XmlDocument();

   soapEnvelopeXml.LoadXml(@"
     
     <ns1:customerdataelement xmlns:ns1="#unknown">
    
    <![CDATA[
     
  <customer>
  <site>
  <customer_no>7435535</customer_no>
 <site_uses>DELIVER_TO</site_uses>
  <name>GREAT SCOTTS EATERY</name>
   <address>1551 CORTEZ ST</address>
  <city>DENVER</city>
  <state>CO</state>
  <zip>0221-6908</zip> <primary_flag></primary_flag>
  <primary_ship_flag></primary_ship_flag>
   </site>
  </customer>
   
      
    </ns1:customerdataelement>
    
    ");



    using (Stream stream = request.GetRequestStream())
    {
        soapEnvelopeXml.Save(stream);
    }

    using (WebResponse response = request.GetResponse())
    {
        using (StreamReader rd = new StreamReader(response.GetResponseStream()))
        {
            string soapResult = rd.ReadToEnd();
            Console.WriteLine(soapResult);
        }
    }
}

public HttpWebRequest CreateWebRequest(String ASMXURL) 
{
    HttpWebRequest webRequest2 = null;
    try
    {
          String action = "\"http://ncrerpjndi/NCROMeOrderInterfaceWS.wsdl/customerData\"";
        webRequest2 = (HttpWebRequest)WebRequest.Create(ASMXURL);
        webRequest2.UserAgent = ".NET Framework Test Client";
        webRequest2.Headers.Add("SOAPAction", action);
        //webRequest2.Headers.Add("Accept-Encoding", "gzip,deflate") ;
        webRequest2.ContentType = "text/xml;charset=UTF-8";
        webRequest2.Method = "POST";
       // return webRequest2;
    }
    catch (WebException wex)
    {
        var pageContent = new StreamReader(wex.Response.GetResponseStream())
                              .ReadToEnd();
        Response.Write(pageContent);
    }
return webRequest2;

}

I am calling this function on button click but getting an error (500) Internal Server Error.

What to do.I can access the service using web reference but the string response could not be bind to grid properly.A string response is basically an address string which contains name,city ,adrress ,zip but split can not be used here since there are no proper spaces in this string Hence need an xml response.Any help would be appreciated.we