using System;
public static class ExtensionMethods
{
public static string Right(this string s, int n)
{
if (n < 0 || n > s.Length)
return s;
else
return s.Substring(s.Length - n);
}
}
public class Tester
{
public static void Main()
{
string hello = "Hello";
Console.WriteLine("hello.Right(-1) = {0}", hello.Right(-1));
Console.WriteLine("hello.Right(0) = {0}", hello.Right(0));
}
}