private string substitution(string inString)
        {
            string normalAlphabet = "abcdefghijklmnopqrstuvwxyz .!?,";
            string cipherAlphabet = "efg.hijk!lmn opqr?stuv,wxyzabcd";
            string cipheredText = "";
            inString = inString.ToLower();
            for (int index1 = 0; index1 < inString.Length; index1++)
            {
                for (int index2 = 0; index2 <= 30; index2++)
                {
                    if (inString[index1] == normalAlphabet[index2])
                    {
                        cipheredText = cipheredText + cipherAlphabet[index2];
                    }
                }
            }
            return cipheredText;
        }

        private string transposition(string inString)
        {
            int myCounter = 0;
            string theFirstWord = "";
            string theLastWord = "";
            while (myCounter < inString.Length)
            {
                theFirstWord = theFirstWord + inString[myCounter];
                myCounter += 2;
            }
            for (myCounter = 1; myCounter < inString.Length; myCounter += 2)
            {
                theLastWord = theLastWord + inString[myCounter];
            }
            return (theFirstWord + " " + theLastWord);
        }