Created a Soap Webservice and calling it in asp.net uisng code and getting error of The remote name could not be resolved - asp.net

Question

I had developed one web service in SOAP format and trying to access service in asp.net using the below mentioned code.
public static void CallWebService()
{
try
{
System.Net.ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
var _url = "https://test.in/ModelDetail/Service.asmx";
var _action = "https://test.in/ModelDetail/GetWarrantyDetails";
XmlDocument soapEnvelopeXml = CreateSoapEnvelope();
HttpWebRequest webRequest = CreateWebRequest(_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 (HttpWebResponse webResponse= (HttpWebResponse)webRequest.EndGetResponse(asyncResult))
{
using (StreamReader rd = new StreamReader(webResponse.GetResponseStream()))
{
soapResult = rd.ReadToEnd();
}
Console.Write(soapResult);
}
}
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 static XmlDocument CreateSoapEnvelope()
{
XmlDocument soapEnvelop = new XmlDocument();
soapEnvelop.LoadXml(#"<soapenv:Envelope xmlns:soapenv='http://schemas.xmlsoap.org/soap/envelope/' xmlns:tem='https://ndb.bmw.in/'><soapenv:Header/><soapenv:Body><tem:GetWarrantyDetails><tem:IP><demono>WBA3Y37070D45</demono></tem:IP></tem:GetWarrantyDetails></soapenv:Body></soapenv:Envelope>");
return soapEnvelop;
}
private static void InsertSoapEnvelopeIntoWebRequest(XmlDocument soapEnvelopeXml, HttpWebRequest webRequest)
{
using (Stream stream = webRequest.GetRequestStream())
{
soapEnvelopeXml.Save(stream);
}
}
but when i call this code i get error of The remote name could not be resolved.
Tried all method but get this error only.
What is missing or wrong i am doing?