Lan Chat basics in Visual Basic using the TCP. The code below is based on my YouTube tutorial (http://www.youtube.com/watch?v=Pd8TGRrDDMc&list=PL63C2673281C99172&index=3).

receiver.vb

' Tutorial @ http://www.youtube.com/watch?v=Pd8TGRrDDMc&list=PL63C2673281C99172&index=3
Option Explicit On
Imports System.IO
Imports System.Net.Sockets

Public Class Form1
    Dim Listener As New TcpListener(8000)
    Dim Client As TcpClient
    
    Private Sub _FormClosing() Handles Me.FormClosing
        Listener.Stop()
    End Sub

    Private Sub _Load() Handles MyBase.Load
        Timer1.Start()
        Listener.Start()
    End Sub

    Private Sub _Tick() Handles Timer1.Tick
        Dim Message As String
        Dim nStart As Integer
        Dim nLast As Integer

        If Listener.Pending = True Then
            Message = ""
            Client = Listener.AcceptTcpClient()
            Dim Reader As New StreamReader(Client.GetStream())

            While Reader.Peek > -1
                Message &= Convert.ToChar(Reader.Read()).ToString
            End While

            If Message.Contains("</>") Then
                nStart = InStr(Message, "</>") + 4
                nLast = InStr(Message, "<\>")
                Message = Mid(Message, nStart, nLast - nStart)
            End If

            Label1.Text = Message
        End If
    End Sub
End Class

sender.vb

' Tutorial @ http://www.youtube.com/watch?v=Pd8TGRrDDMc&list=PL63C2673281C99172&index=3
Option Explicit On
Imports System.IO
Imports System.Net.Sockets

Public Class Form1
    Dim Client As TcpClient

    Private Sub btnClick() Handles Button1.Click
        Try
            Client = New TcpClient("127.0.0.1", 8000)
            Dim Writer As New StreamWriter(Client.GetStream())
            Writer.Write("</> " & TextBox1.Text & " <\>"
            Writer.Flush
        Catch ex As Exception
            MsgBox(ex.Message)
        End Try
    End Sub
End Class

Hi ryan I got little Problem I don't know how to show them in every single text box in receiver thank you. [email protected]

Sender
Option Explicit On
Imports System.IO
Imports System.Net.Sockets

Public Class Form1

Dim Client As TcpClient

Private Sub btnClick() Handles Button1.Click

    Try
        Client = New TcpClient(TextBox1.Text, 8000)
        Dim Writer As New StreamWriter(Client.GetStream())

        Writer.Write("</> " & TextBox2.Text & " <\>")
        Writer.Flush()

        Writer.Write("<!> " & TextBox3.Text & " <@>")
        Writer.Flush()

        Writer.Write("<#> " & TextBox4.Text & " <$>")
        Writer.Flush()

        Writer.Write("<%> " & TextBox5.Text & " <^>")
        Writer.Flush()

    Catch ex As Exception
        MsgBox(ex.Message)
    End Try

End Sub

End Class

receiver
Option Explicit On
Imports System.IO
Imports System.Net.Sockets

Public Class Form1
Dim Listener As New TcpListener(8000)
Dim Client As TcpClient

Private Sub _FormClosing() Handles Me.FormClosing
    Listener.Stop()  
End Sub

Private Sub _Load() Handles MyBase.Load
    Timer1.Start()
    Listener.Start()
End Sub

Private Sub Timer1_Tick() Handles Timer1.Tick
    Dim Message As String
    Dim Message1 As String
    Dim Message2 As String
    Dim Message3 As String
    Dim nStart As Integer
    Dim nLast As Integer


    If Listener.Pending = True Then
        Message = ""
        Client = Listener.AcceptTcpClient()
        Dim Reader As New StreamReader(Client.GetStream())

        While Reader.Peek > -1
            Message &= Convert.ToChar(Reader.Read()).ToString


        End While

        If Message.Contains("</>") Then
            nStart = InStr(Message, "</>") + 4
            nLast = InStr(Message, "<\>")
            Message = Mid(Message, nStart, nLast - nStart)
            RichTextBox1.Text = Message
            TextBox2.Text = Message

        ElseIf Message.Contains("<!>") Then
            nStart = InStr(Message, "<!>") + 4
            nLast = InStr(Message, "<@>")
            Message1 = Mid(Message, nStart, nLast - nStart)
            RichTextBox1.Text = Message
            TextBox3.Text = Message

        ElseIf Message.Contains("<#>") Then
            nStart = InStr(Message, "<#>") + 4
            nLast = InStr(Message, "<$>")
            Message2 = Mid(Message, nStart, nLast - nStart)
            RichTextBox1.Text = Message
            TextBox4.Text = Message

        ElseIf Message.Contains("<%>") Then
            nStart = InStr(Message, "<%>") + 4
            nLast = InStr(Message, "<^>")
            Message3 = Mid(Message, nStart, nLast - nStart)
            RichTextBox1.Text = Message
            TextBox5.Text = Message

        End If
    End If
End Sub

Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
    RichTextBox1.Text = ""

End Sub

End Class