ช่วยอธิบายให้ฟังหน่อยครับ ว่าแต่ละตัวคืออะไร ผมจะฝึกเขียน socket หนังสือหาแล้ว ไม่มีขาย

Imports System.Net.Sockets
Imports System.Text
Public Class Form1
    Dim clientSocket As New System.Net.Sockets.TcpClient()
    Dim serverStream As NetworkStream           <<<<<<<<<<<<<<<<<

    Private Sub Button1_Click(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles Button1.Click
        Dim serverStream As NetworkStream = clientSocket.GetStream()
        Dim outStream As Byte() = _
        System.Text.Encoding.ASCII.GetBytes("test")
        serverStream.Write(outStream, 0, outStream.Length)             <<<<<<<<<<<<<<<<<
        serverStream.Flush()           <<<<<<<<<<<<<<<<<

        Dim inStream(10024) As Byte
        serverStream.Read(inStream, 0, CInt)             <<<<<<<<<<<<<<<<<
        Dim returndata As String = _
        System.Text.Encoding.ASCII.GetString(inStream)
        msg("Data from Server : ")
    End Sub

    Private Sub Form1_Load(ByVal sender As System.Object, _
        ByVal e As System.EventArgs) Handles MyBase.Load
        msg("server2")
        clientSocket.Connect("127.0.0.1", 79)
        Label1.Text = "Client Socket Program - Server Connected ..."
    End Sub

    Sub msg(ByVal mesg As String)
        RichTextBox1.Text = RichTextBox1.Text + Environment.NewLine + " >> " + mesg
    End Sub
End Class