The Client Socket Program is the continuation of the Server Socket Program . The Client Socket Program is a Windows based application .

Client connect to the Port 8888 of the Server Socket Program , and the IP Address (Computer Name) here we give as 127.0.0.1 , because the Server and client running on the same machine .

clientSocket.Connect("127.0.0.1", 8888)

When client gets connected , it reads data from NetworkStream , and also write to NetworkStream . When you start the client program you will get message client started . When press the button at the bottom its send a message to Server and also receive a message from Server.

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("Message from Client$")
serverStream.Write(outStream, 0, outStream.Length)
serverStream.Flush()

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

Private Sub Form1_Load(ByVal sender As System.Object, _
ByVal e As System.EventArgs) Handles MyBase.Load
msg("Client Started")
clientSocket.Connect("127.0.0.1", 8888)
Label1.Text = "Client Socket Program - Server Connected ..."
End Sub

Sub msg(ByVal mesg As String)
TextBox1.Text = TextBox1.Text + Environment.NewLine + " >> " + mesg
End Sub
End Class

Brfore you run the Client Socket Program you should start Server Socket Program first . For more details of running this program , take a look at the VB.NET Socket Programming .