Am new to .Net and web service..i like to pass id through url..how to do that?whether it was done post or get method?guide me

string url = "http://XXXXX//"+id=22;

WebRequest request = WebRequest.Create(url);
        request.Proxy.Credentials = new NetworkCredential(xxxxx);
        request.Credentials = CredentialCache.DefaultCredentials;
        //add properties
        request.Method = "GET";
        request.ContentType = "application/json";
        //convert 
        byte[] byteArray = Encoding.UTF8.GetBytes(data);
        request.ContentLength = byteArray.Length;
        //post data
        Stream streamdata = request.GetRequestStream();
        streamdata.Write(byteArray, 0, byteArray.Length);
        streamdata.Close();
        //response
        WebResponse response = request.GetResponse();
        // Get the stream containing content returned by the server.
        Stream dataStream = response.GetResponseStream();
        // Open the stream using a StreamReader for easy access.
        StreamReader reader = new StreamReader(dataStream);
        // Read the content.
        string responseFromServer = reader.ReadToEnd();
        // Clean up the streams and the response.
        reader.Close();
        response.Close();

Thanks in advance