using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        double? nextContactTime = null;

​

            var payload = new Dictionary<string, string>

            {

                { "NextContactTime" , Convert.ToInt32(nextContactTime).ToString()}

            };

​

            Console.WriteLine("Hello World");

        Console.WriteLine("Paylaod:{0}", payload);

        var outout = Convert.ToInt32(nextContactTime).ToString();

        Console.WriteLine("outt:{0}", outout);

    }

}