OTP Generator

 private static string GenerateRandomOtp(int iOTPLength)
        {
            string[] saAllowedCharacters = { "1", "2", "3", "4", "5", "6", "7", "8", "9", "0", "A", "B", "C", "D", "E", "F", "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z" };
            string sOTP = String.Empty;
            string sTempChars = String.Empty;

            Random rand = new Random();

            for (int i = 0; i < iOTPLength; i++)
            {
                int p = rand.Next(0, saAllowedCharacters.Length);
                sTempChars = saAllowedCharacters[rand.Next(0, saAllowedCharacters.Length)];
                sOTP += sTempChars;
            }
            return sOTP;
        }