using System;

using System.Collections.Generic;

using System.Linq;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

            [

                [""addr"",""field""],

                [""Administrator@cadomain.com"",1000],

                [""test1@cadomain.com"",1001],

                [""test2@cadomain.com"",1002],

                [""67656x3434"",100],

                [""99999"",511],

                [""79898"",400],

                [""545654"",561],

                [""7979"",200],

                [""6776767"",201],

                [""4656"",300],

                [""88888"",5000]

            ]";

        JToken token = JToken.Parse(json);

        Dictionary<int, string> dict = new Dictionary<int, string>();

        bool skippedFirstItem = false;

        foreach (JToken item in token)

        {

            if (skippedFirstItem)

                dict.Add((int)item[1], (string)item[0]);

            else

                skippedFirstItem = true;

        }

        foreach (int key in dict.Keys)

        {

            Console.WriteLine(key + ": " + dict[key]);

        }

    }

}

​