using System;

using System.Data;

using System.Data.SqlClient;

using Newtonsoft.Json.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string id = null;

        JObject obj = new JObject();

        obj["id"] = id;

        if(obj["id"] != null && obj["id"].Type != JTokenType.Null)

        {

            string val = (string)obj["id"];

            Console.WriteLine(val.Replace("\r", @"\r"));

        }

    }

}