using System;

using System.Diagnostics;

using System.Text;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var list = new string[3][] {

            new string[3] { "a","b","c" },

            new string[3] {"1","2","3" },

            new string[3] {"4","5","6"}

        };

        var json = toJson(list);

        Console.WriteLine(json);

    }

    public static string toJson(string[][] csvArray) {

        var sb = new StringBuilder("{\n\"elements\": [\n");

        var headers = new string[csvArray[0].Length];

        for(int i = 0; i < csvArray[0].Length; i++)

        {

            headers[i] = csvArray[0][i];

        }

        for(int i = 1; i < csvArray.Length; i++)

        {

            sb.AppendLine("{");

            for(int j = 0; j < csvArray[i].Length; j++)

            {

                sb.AppendLine("\"" + headers.ElementAtOrDefault(j) + "\": \"" + csvArray[i][j] + "\",");

            }

            sb.Remove(sb.Length-3, 3); // remove last ",/n" to make json valid

            sb.AppendLine("\n},");

        }

        sb.Remove(sb.Length-3, 3); // remove last ",/n" to make json valid

        sb.AppendLine("\n]\n}");

        return sb.ToString();

    }

}