using System;

using System.Linq;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

public class Program

{

    public static void Main()

    {

        string json = @"

        [

            {

                ""col1"": ""foo"",

                ""col2"": ""bar""

            },

            {

                ""col1"": ""baz"",

                ""col2"": ""quux""

            },

            {

                ""col1"": ""fizz"",

                ""col2"": ""bang""

            }

        ]";

        JArray array = JArray.Parse(json);

        JArray sorted = new JArray(array.OrderBy(obj => (string)obj["col2"]));

        Console.WriteLine(sorted.ToString(Formatting.Indented));

    }

}