you can try with Json.Net. Sample console application code:
using System.Collections.Generic;
using Newtonsoft.Json;
namespace ConsoleApplication11
{
class Program
{
static void Main(string[] args)
{
MyData data = new MyData()
{
aaData = new List<list><string>>()
{
new List<string>(){"Trident","Internet Explorer 4.0","Win 95+","4","X"},
new List<string>(){"Trident","Internet Explorer 5.0","Win 95+","5","C"},
new List<string>(){"Trident","Internet Explorer 5.5","Win 95+","5.5","A"}}
};
string json = JsonConvert.SerializeObject(data);
}
}
public class MyData
{
public List<list><string>> aaData { get; set; }
}
}