using System;

using RestSharp;

​

public class Program

{

    public static void Main()

    {

        Foo foo = new Foo{Bar = "éddd ''"};

        string json = Newtonsoft.Json.JsonConvert.SerializeObject(foo);

        Console.WriteLine(json);

        var client = new RestClient("https://reqres.in");

        var request = new RestRequest("/api/users?page=2", Method.GET);

        request.AddHeader("Content-Type", "application/json");

        request.AddJsonBody(foo);

        Console.WriteLine(request.Parameters[1]);

        var response = client.Execute(request);

        //Console.WriteLine(response.Content);

        string json2 = RestSharp.SimpleJson.SerializeObject(foo);

        Console.WriteLine(json2);

    }

}

​

public class Foo

{

    public string Bar

    {

        get;

        set;

    }

}