using System;

using Newtonsoft.Json;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"{

  ""Date"": ""2016-12-14"",

  ""Stats"": {

    ""A"": 9.23,

    ""B"": 5.63,

    ""C"": 0

  }

}";

        JObject result = JsonConvert.DeserializeObject<JObject>(json);

        JObject statsObj = (JObject)result["Stats"];

        for(int i = statsObj.Properties().Count()-1; i>=0; i--)

        {

            var propValue = statsObj.Properties().Skip(i).FirstOrDefault();

            if (decimal.Parse(propValue.Value.ToString()) <= 0)

                propValue.Remove();

        }

​

        string endResult = result.ToString();

        Console.WriteLine(endResult);

​

    }

}