Consuming SAP WSDL from C#, net

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C#

SAP

webservice

Hi,

I am trying to access the SAP WSDL service in c#.net. Even though I have put correct credentials it throws "The remote server returned an error: (401) Unauthorized." error. I am able to access the SAP service using SoapUI application with these same credentials on the same machine. I need to connect to VPN before accessing these SAP services. Not sure what is causing this problem.
Is there anything specific that needs to be done here?

What I have tried:

I have tried the following codes.
1.

System.Net.WebClient client = new System.Net.WebClient();
client.Credentials = new NetworkCredential("", "");
client.Headers[HttpRequestHeader.Authorization] = "Basic";
//-Connect To the web service Getting 401 error in following line
using (System.IO.Stream stream = client.OpenRead("***?sap-client=200"))
{
}

2.

public void InvokeService()
        {

            HttpWebRequest Req = (HttpWebRequest)WebRequest.Create(@"*****?sap-client=200");
            Req.Credentials = new NetworkCredential("***", "***", "***");
            Req.Headers.Add(@"SOAP:Action");
            Req.ContentType = "text/xml;charset=\"utf-8\"";
            Req.Accept = "text/xml";
            Req.Method = "POST";

            XmlDocument SOAPReqBody = new XmlDocument();
            SOAPReqBody.LoadXml(@"<?xml version=""1.0"" encoding=""utf-8""?>
            <soap:Envelope xmlns:soap=""http://schemas.xmlsoap.org/soap/envelope/"" xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"" xmlns:xsd=""http://www.w3.org/2001/XMLSchema"">
             <soap:Body>
                <Addition xmlns=""http://tempuri.org/"">
                  <a>" + 10 + @"</a>
                  " + 20 + @"
                </Addition>
              </soap:Body>
            </soap:Envelope>");
            using (Stream stream = Req.GetRequestStream())
            {
                SOAPReqBody.Save(stream);
            }
            //Getting 401 error in following line
            using (WebResponse Serviceres = Req.GetResponse())
            {
                using (StreamReader rd = new StreamReader(Serviceres.GetResponseStream()))
                {

                }
            }
        }