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/Program.cs

using System;
using System.Linq;
using System.Collections.Generic;
using Newtonsoft.Json;
					
public class Program
{
	public static void Main()
	{
		string jsonContent = "[{\"fields\":[[\"name\",\"value\",\"values\",\"error\"],[\"correspondsApi\",\"N\",null,\"\"],[\"username\",\"[email protected]\",null,\"\"],[\"password\",\"\",null,\"\"],[\"accountid\",\"\",null,\"\"],[\"rememberMe\",\"Y\",null,\"\"],[\"language\",\"en-US\",null,\"\"],[\"S\",\"tokenValue\",null,null],[\"authToken\",\"\",null,\"\"]], \"success\":\"Y\",\"message\":\"Access is granted\"}]";
            JsonConvert.DeserializeObject<List<MyArray>>(jsonContent);
	}
}

public class MyArray
    {
        public List<List<string>> fields { get; set; }
        public string success { get; set; }
        public string message { get; set; }
    }

    public class Root
    {
        public List<MyArray> MyArray { get; set; }
    }