How do I create an API server for a mock to send and receive Json?

using System;
using System.IO;
using System.Net;
using System.Runtime.Serialization.Json;
using System.Text;

class program
{
    static void Main (string[]args)
    {
        using(varh=new HttpListener())
        {
            // TODO—Specifies the hostname and port to listen to.
            h.Prefixes.Add("http://*:58080/";
            h.Start();

            for ( ; ; )
            {
                varc=h.GetContext();

                var request = c. Request;

                // TODO: Now I'm going to separate the URLs.
                Console.WriteLine(req.RawUrl);

                if(req. HasEntityBody)
                {
                    // TODO—This is where the request body is processed.
                    using(varsr=new StreamReader(req.InputStream, new UTF8 Encoding(false)))))
                    {
                        Console.WriteLine(sr.ReadToEnd());
                    }
                }

                // Value you want to return as JSON
                value = new Result() {Value = true, Message = "Aye abcde";

                // Write JSON to the response.
                HttpListenerResponseres=null;
                try
                {
                    res=c.Response;
                    res.ContentType="application/json";
                    newDataContractJsonSerializer(typeof(Result)) .WriteObject(res.OutputStream,value);
                }
                finally
                {
                    res.Close();

                }
            }
        }
    }
}
public class Result
{
    public pool value {get;set;}

    public string message {get;set;}
}