File Stream C#

using System;
    using System.IO;
    using System.Text;
    using System.Security.AccessControl;
    class FileStreamExample
    {
        public static void Main()
        {
            try
            {
                byte[] messageByte = Encoding.ASCII.GetBytes("Here is some data.");
                FileStream fWrite = new FileStream("test.txt", FileMode.Create, FileAccess.ReadWrite, FileShare.None, 8, FileOptions.None);
                fWrite.WriteByte((byte)messageByte.Length);
                fWrite.Write(messageByte, 0, messageByte.Length);
                fWrite.Close();
                FileStream fRead = new FileStream("test.txt", FileMode.Open);
                int length = (int)fRead.ReadByte();
                byte[] readBytes = new byte[length];
                fRead.Read(readBytes, 0, readBytes.Length);
                fRead.Close();
                Console.WriteLine(Encoding.ASCII.GetString(readBytes));
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
            }
        }
    }