using System;

using System.Linq;

using System.Web;

​

public class Program

{

    public static void Main()

    {

        var strToEncode = "123%252F123";

        Console.WriteLine("String:\t\t\t\t" + strToEncode);

        Console.Write("\n");

        var valueA = strToEncode;

        //var valueA = HttpUtility.UrlEncode(strToEncode);

        Console.WriteLine("UrlEncode: \t\t\t" + valueA);

        Console.WriteLine("UrlDecode: \t\t\t" + HttpUtility.UrlDecode(valueA));

        Console.WriteLine("UnescapeDateString:\t" + System.Uri.UnescapeDataString(valueA));

        Console.WriteLine();

        var value = strToEncode;

        //var value = System.Uri.EscapeDataString(strToEncode);

        Console.WriteLine("EscapeDateString:  \t" + value);

        Console.WriteLine("UrlDecode: \t\t\t" + HttpUtility.UrlDecode(value));

        Console.WriteLine("UnescapeDateString:\t" + System.Uri.UnescapeDataString(value));

    }

}