using System;

using System.Text.Json;

using System.Text.Json.Serialization;

​

public class DownloadHelper {

        private String _URL;

        private String _FilePath;

        public String URL

        {

            get { return _URL; }

            set

            {

                _URL = value;

                Download();

            }

        }

        public String FilePath

        {

            get { return _FilePath; }

            set

            {

                _FilePath = value;

            }

        }

    public void Download() {}

    }

​

​

public class Program

{

    public static void Main()

    {

        DownloadHelper c = new DownloadHelper();

        c.URL = "10.10.14.26";

        c.FilePath = "foobar";

        string jsonString;

        jsonString = JsonSerializer.Serialize(c);

​

        Console.WriteLine(jsonString);

    }

}