using System;

using Newtonsoft.Json;

public class Program

{

    public static void Main()

    {

        string json = @"{

            'site_id':'1',

            'endpoints':

            [{

                  'miu_id':'111',

                  'meter_number':'88',

                  'consumption_history':

                  [{

                      'reading_date':'2010-02-17T00:00:00',

                      'consumption':1.0,

                      'consumption_with_multiplier':1.0

                  }]

            }]

        }";

        dynamic j = JsonConvert.DeserializeObject<dynamic>(json);

        string site_id = j["site_id"].ToString();

        var endpoints = j["endpoints"];

        foreach (var endpoint in endpoints)

        {

            string miu_id = endpoint["miu_id"];

            miu_id.Dump();

            // ...

            var consumption_history = endpoint["consumption_history"];

            foreach(var consumption in consumption_history)

            {

                string reading_date = consumption["reading_date"];

                reading_date.Dump();

                // ...

            } // foreach

        } // foreach

    }

}