using System;
public class Program
{
public static void Main()
var u = "John's book";
var t = Uri.EscapeDataString(u.Replace("'", "''"));
var s = Uri.EscapeDataString(u.Replace("'", "\'"));
var y = Uri.EscapeDataString(u);
Console.WriteLine(t);
Console.WriteLine(s);
Console.WriteLine(y);
}