C# รบกวนพี่ๆที่พอจะอธิบายการทํางานของ Code ได้ ชวยหน่อยหน่ะครับ

โปรแกรมที่ 1

        static void Main()
        {
            string astring = "Now is the time";
            int pos;
            string word;

            ArrayList words = new ArrayList();
            pos = astring.IndexOf(" ");
            while (pos > 0)
            {
                word = astring.Substring(0, pos);
                words.Add(word);
                astring = astring.Substring(pos + 1, astring.Length - (pos + 1));
                pos = astring.IndexOf(" ");
                if (pos == -1)
                {
                    word = astring.Substring(0, astring.Length);
                    words.Add(word);
                }

โปรแกรมที่ 2

        static void Main()
        {
            string astring = "now is the time for all good people ";
            ArrayList words = new ArrayList();

            words = SplitWords(astring);
            foreach (string word in words)
                Console.Write(word + " ");
            Console.Read();
        }
        static ArrayList SplitWords(string astring)
        {
            string[] ws = new string[astring.Length - 1];
            ArrayList words = new ArrayList();
            int pos;
            string word;
            pos = astring.IndexOf(" ");
            while (pos > 0)
            {
                word = astring.Substring(0, pos);
                words.Add(word);
                astring = astring.Substring(pos + 1, astring.Length - (pos + 1));
                if (pos == -1)
                {
                    word = astring.Substring(0, astring.Length);
                    words.Add(word);
                }

โปรแกรมที่ 3 

         static void Main() {
            string data = "Mike,McMillan,3000 W. Scenic,North Little Rock,AR,72118";
            string[] sdata;
            char[] delimter = new char[] {','};
            sdata = data.Split(delimter, data.Length);
            foreach (string word in sdata)
                Console.Write(word + " ");
            string joined;
            joined = string.Join(",", sdata);
            Console.Write(joined);
        }

โปรแกรมที่ 4 

  static void Main() {
            int size = 100;
            Timing timeSB = new Timing();
            Timing timeST = new Timing();
            Console.WriteLine();
            for(int i = 0; i <= 3; i++) {
                timeSB.startTime();
                BuildSB.(size);
                timeSB.stopTime();
                timeST.startTime();
                BuilString(size);
                timeST.stopTime();
                Console.WriteLine
                    ("Time (in milliseconds) to build StringBuilder"
                    + "object for " & size & " elements : +
                    timeSB.Result.TotalMilliseconds);
                Console.WriteLine
                    (("Time (in milliseconds) to build String object"
                    + " for " & size & " elements : "+
                    timeSB.Result.TotalMilliseconds);
                Console.WriteLine();
                size *= 10;
            }
        }
        static void BuildSB(int size) {
            StringBuilder sbObject = new StringBuilder();
            for(int i = 0; i <= size; i++)
                sbObject.Append("a");
        }
        static void BuildString(int size) {
            string stringObject = "";
            for(int i = 0; i <= size; i++)
                stringObject & = "a";

        }