using System;

using System.IO;

​

public class Program

{

    public static void Main()

    {

        char[] invalidFileChars = Path.GetInvalidFileNameChars();

        foreach (char someChar in invalidFileChars)

        {

            if (Char.IsWhiteSpace(someChar))

            {

                Console.WriteLine(",\t{0:X4}", (int)someChar);

            }

            else

            {

                Console.WriteLine("{0:c},\t{1:X4}", someChar, (int)someChar);

            }

        }

    }

}