using System;

public class Program

{

    public static void Main()

    {

        string s = "ff.0D.AA.15";

        int iCount = 0;

        string[] arrStrings = s.Split('.');

        byte[] arrBytes = new byte[arrStrings.Length];

        foreach (string arrString in arrStrings)

        {

            Console.WriteLine(arrString);

        }

​

        Console.WriteLine (arrStrings.Length);

        while (iCount < arrStrings.Length)

        {

            arrBytes[iCount] = Convert.ToByte(arrStrings[iCount], 16);

            iCount++;

​

        }

        foreach (byte arrByte in arrBytes)

        {

            Console.WriteLine(arrByte);

        }

    }

}