class ANSIToUnicode
{
    static void Main()
    {
        // Create a file that contains the Greek work ψυχή (psyche) when interpreted by using 
        // code page 737 ((DOS) Greek). You can also create the file by using Character Map 
        // to paste the characters into Microsoft Word and then "Save As" by using the DOS
        // (Greek) encoding. (Word will actually create a six-byte file by appending "\r\n" at the end.)
        System.IO.File.WriteAllBytes(@"greek.txt", new byte[] { 0xAF, 0xAC, 0xAE, 0x9E });

        // Specify the code page to correctly interpret byte values
        Encoding encoding = Encoding.GetEncoding(737); //(DOS) Greek code page
        byte[] codePageValues = System.IO.File.ReadAllBytes(@"greek.txt");

        // Same content is now encoded as UTF-16
        string unicodeValues = encoding.GetString(codePageValues);

        // Show that the text content is still intact in Unicode string
        // (Add a reference to System.Windows.Forms.dll)
        System.Windows.Forms.MessageBox.Show(unicodeValues);

        // Same content "ψυχή" is stored as UTF-8
        System.IO.File.WriteAllText(@"greek_unicode.txt", unicodeValues);

        // Conversion is complete. Show the bytes to prove the conversion. 
        Console.WriteLine("8-bit encoding byte values:");
        foreach(byte b in codePageValues)
            Console.Write("{0:X}-", b);

        Console.WriteLine();
        Console.WriteLine("Unicode values:");
        string unicodeString = System.IO.File.ReadAllText("greek_unicode.txt");
        System.Globalization.TextElementEnumerator enumerator = 
            System.Globalization.StringInfo.GetTextElementEnumerator(unicodeString);
        while(enumerator.MoveNext())
        {                
           string s = enumerator.GetTextElement();
           int i = Char.ConvertToUtf32(s, 0);                
           Console.Write("{0:X}-", i);          
        }                
        Console.WriteLine();

        // Keep the console window open in debug mode.
        Console.Write("Press any key to exit.");
        Console.ReadKey();
    }
    /*
     * Output:
        8-bit encoding byte values:
        AF-AC-AE-9E
        Unicode values:
        3C8-3C5-3C7-3B7
    */
}