using System;

public class Program

{

    public static void Main()

    {

        var encodedJson = "%7B%22action%22%3A%22customCode%22%2C%22content%22%3A%22%3Cscript%20type%3D%5C%22text%2Fjavascript%5C%22%3E%20%2F*TT%3ESC%20%7C%20v3%20%3D%3D%3E%20Response%20Plug-ins*%2F%20window.s_tnt%3Dwindow.s_tnt%7C%7C''%2CtntVal%3D'473554%3A0%3A0%2C'%3B%20if(window.s_tnt.indexOf(tntVal)%3D%3D-1)%7Bwindow.s_tnt%2B%3DtntVal%7D%20%3C%2Fscript%3E%22%7D";

        Console.WriteLine("Html Decoded ...");

        Console.Write("\t");

        string decodedJson;

        decodedJson = System.Net.WebUtility.HtmlDecode(encodedJson);

        Console.WriteLine(decodedJson);

        Console.WriteLine("");

        Console.WriteLine("Url Decoded ...");

        Console.Write("\t");

        decodedJson = System.Net.WebUtility.UrlDecode(encodedJson);

        Console.WriteLine(decodedJson);

    }

}