XmlDocument XMLResponse = null;
    System.Net.HttpWebRequest request;
    System.Net.HttpWebResponse objHttpWebResponse = null;
    System.IO.Stream objRequestStream = null;
    System.IO.Stream objResponseStream = null;
    //Declare XMLReader
    XmlTextReader objXMLReader;
    request = (HttpWebRequest)WebRequest.Create("https://xyz");
    string user = "m";
    string pwd = "zxc";
    string auth = "Basic " + Convert.ToBase64String(System.Text.Encoding.Default.GetBytes(user + ":" + pwd));
    request.Headers.Add("Authorization", auth);
    request.Credentials = System.Net.CredentialCache.DefaultCredentials;
    try
    {
        byte[] bytes;
        bytes = System.Text.Encoding.ASCII.GetBytes(v_objXMLDoc);
        request.Method = "POST";
        request.ContentLength = bytes.Length;

        request.ContentType = "application/x-www-form-urlencoded";
        objRequestStream = request.GetRequestStream();
        objRequestStream.Write(bytes, 0, bytes.Length);
        objRequestStream.Close();
        objHttpWebResponse = (HttpWebResponse)request.GetResponse();
        if (objHttpWebResponse.StatusCode == HttpStatusCode.OK)
        {
            objResponseStream = objHttpWebResponse.GetResponseStream();
            System.IO.StreamReader reader = new          System.IO.StreamReader(objResponseStream);
            string responseFromServer = reader.ReadToEnd();
            Console.WriteLine(responseFromServer);
            return responseFromServer;
            reader.Close();

        }
        objHttpWebResponse.Close();