using System;

using System.IO;

using System.Text.RegularExpressions;

​

public class Test

{

    public static void Main()

        {

            // Get a list of invalid path characters.

            char[] invalidPathChars = Path.GetInvalidPathChars();

​

            Console.WriteLine("The following characters are invalid in a path:");

            ShowChars(invalidPathChars);

            Console.WriteLine();

​

            // Get a list of invalid file characters.

            char[] invalidFileChars = Path.GetInvalidFileNameChars();

​

            Console.WriteLine("The following characters are invalid in a filename:");

            ShowChars(invalidFileChars);

        }

​

        public static void ShowChars(char[] charArray)

        {

            Console.WriteLine("Char\tHex Value");

            // Display each invalid character to the console.

            foreach (char someChar in charArray)

            {

                if (Char.IsWhiteSpace(someChar))

                {

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

                }

                else

                {

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

                }

            }

        }

}