using System;

using System.Web;

public class Program

{

    public static void Main()

    {

        var test = HttpUtility.UrlEncode("https://dotnetfiddle.net/");

        Console.WriteLine(test);

        var test2 = HttpUtility.UrlEncode(test);

        Console.WriteLine(test2);

        var test3 = HttpUtility.UrlDecode(test);

        Console.WriteLine(test3);

        var test4 = HttpUtility.UrlDecode(test2);

        Console.WriteLine(test4);

    }

}