using System;

 using System.Web.Security.AntiXss;

public class Program

{

    public static void Main()

    {

        Encode("a\n\nb");

        Encode("a\t\tb");

    }

​

    public static void Encode(string input)

    {

        var encoded = AntiXssEncoder.HtmlEncode(input, false);

        Console.WriteLine("{0} \n{1}", input, encoded );

    }

}