using System;

using Newtonsoft.Json;

public class Program

{

    static readonly string json_string = @"[  

   {  

      ""latitude"":""1"",

      ""longitude"":""2""

   },

   {  

      ""latitude"":""-3"",

      ""longitude"":""5""

   }

]";

    public static void Main()

    {

        var result = JsonConvert.DeserializeObject<Coordinate[]>(json_string);

        foreach(var item in result)

        {

            Console.WriteLine(string.Format("Latitude: {0}, Longitude: {1}",item.Latitude, item.Longitude));

        }

    }

}

​

 public class Coordinate

 {

    [JsonProperty("latitude")]

    public string Latitude { get; set; }

​

    [JsonProperty("longitude")]

    public string Longitude { get; set; }

 }