using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Serialization;

using System.Globalization;

​

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Turkey culture");

        var data = JsonConvert.SerializeObject(new Payload()

        {Client_Id = "cocon", Name = "cocon"}, new JsonSerializerSettings{Culture = new CultureInfo("tr-TR"), ContractResolver = new LowercaseContractResolver()});

        Console.WriteLine(data);

        Console.WriteLine("");

        Console.WriteLine("No culture defined");

        var data2 = JsonConvert.SerializeObject(new Payload()

        {Client_Id = "cocon", Name = "cocon"}, new JsonSerializerSettings{ContractResolver = new LowercaseContractResolver()});

        Console.WriteLine(data2);

    }

}

​

public class Payload

{

    public string Client_Id

    {

        get;

        set;

    }

​

    public string Name

    {

        get;

        set;

    }

}

​

public class LowercaseContractResolver : DefaultContractResolver

{

    protected override string ResolvePropertyName(string propertyName)

    {

        return propertyName.ToLower();

    }

}