서버에서 post형식으로 JSON 값 호출

var httpWebRequest = (HttpWebRequest)WebRequest.Create("http://url");

httpWebRequest.ContentType = "application/json";

httpWebRequest.Method = "POST";



using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))

{

    string json = "{\"user\":\"test\"," +

                  "\"password\":\"bla\"}";



    streamWriter.Write(json);

    streamWriter.Flush();

    streamWriter.Close();

}



var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();

using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))

{

    var result = streamReader.ReadToEnd();

}