Server - Client Communication

[4hya]

ok. here, what I want to establish here is these scenario.

a.the client must connect to the server. and the client can specify values that would be sent.
b.the server would then receive the data and parse them and place them in the server form.
c. ten clients must be connected simultaneously to the server.

my problem is that.
a. my server only accepts one connection at a time.(should be ten)
b.when the client is disconnected.. the client can't connect again.
c.the server can't detect if the client is still connected.
d.the client is still connected even the server is out.

here's my code.

Server:

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        TCPServer1.LocalPort = 666
        TCPServer1.Listen()
        TCPServer2.LocalPort = 667
        TCPServer2.Listen()
        lblrequest.Text = "Listening at " & TCPServer1.LocalIP & " at port " & TCPServer1.LocalPort & " " & TCPServer2.LocalPort
    End Sub

    Private Sub TCPServer1_ConnectionRequest(ByVal sender As Object, ByVal e As AxMSWinsockLib.DMSWinsockControlEvents_ConnectionRequestEvent) Handles TCPServer1.ConnectionRequest
        If TCPServer1.CtlState <> MSWinsockLib.StateConstants.sckClosed Then
            TCPServer1.Close()
        End If
        TCPServer1.Accept(e.requestID)
    End Sub

    Private Sub TCPServer1_DataArrival(ByVal sender As Object, ByVal e As AxMSWinsockLib.DMSWinsockControlEvents_DataArrivalEvent) Handles TCPServer1.DataArrival
        Dim data As String = ""
        Dim opt() As String
        TCPServer1.GetData(data)
        opt = Split(data, "||")

        
        If opt(0) = "connected" Then
            Judge1Stat.Text = "Judge 1 Connected!"
        End If

        For i As Integer = 0 To opt.Length - 1
            ListBox1.Items.Add("opt" & i & opt(i))
        Next
        If opt(0) = "AScore1" Then
            AScore11.Text = opt(1)
            AScore12.Text = opt(2)
            AScore13.Text = opt(3)
        End If
    End Sub

    
    Private Sub TCPServer2_ConnectionRequest(ByVal sender As Object, ByVal e As AxMSWinsockLib.DMSWinsockControlEvents_ConnectionRequestEvent) Handles TCPServer2.ConnectionRequest
        If TCPServer2.CtlState <> MSWinsockLib.StateConstants.sckClosed Then
            TCPServer2.Close()
        End If
        TCPServer2.Accept(e.requestID)
    End Sub

    Private Sub TCPServer2_DataArrival(ByVal sender As Object, ByVal e As AxMSWinsockLib.DMSWinsockControlEvents_DataArrivalEvent) Handles TCPServer2.DataArrival
        Dim data As String = ""
        Dim opt() As String
        TCPServer1.GetData(data)
        opt = Split(data, "||")

        
        If opt(0) = "connected" Then
            Judge2Stat.Text = "Judge 2 Connected!"
        End If

        For i As Integer = 0 To opt.Length - 1
            ListBox1.Items.Add("opt" & i & opt(i))
        Next
        If opt(0) = "AScore1" Then
            Score1.Text = opt(1)
            Score2.Text = opt(2)
            Score3.Text = opt(3)
        End If
    End Sub

Client

Public Class frmClient
    Inherits System.Windows.Forms.Form
    Public StatConn As Boolean = False

    Private Sub frmClient_DoubleClick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.DoubleClick
        Dim a As String
        a = InputBox("Enter Password")
        If a = "password" Then
            Me.Visible=false
            frmServer.Visible = True
        Else
        End If
    End Sub
    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        tcpClient.Enabled = False
        tcpClient.Close()
        tcpClient.LocalPort = 1223
        tcpClient.Listen()

        Dim HostIP As String = txtHostIP.Text
        Select Case StatConn
            Case True
                StatLabel.Text = "Connected to " & HostIP
            Case Else
                StatLabel.Text = "Disconnected from server"
        End Select

        frmServer.Visible = True
    End Sub
    Private Sub panelStat_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles panelStat.Paint
        Dim p As Pen
        Dim r As Rectangle
        Dim stat As Control
        stat = panelStat
        r = New Rectangle(0, 0, 8, 8)
        Dim colorbrush As SolidBrush
        Select Case StatConn
            Case True
                p = New Pen(System.Drawing.Color.Green)
                colorbrush = New SolidBrush(Color.Green)
            Case Else
                p = New Pen(System.Drawing.Color.Red)
                colorbrush = New SolidBrush(Color.Red)
        End Select
        e.Graphics.DrawEllipse(p, r)
        e.Graphics.FillEllipse(colorbrush, r)

    End Sub

    Private Sub tmTime_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmTime.Tick
        If tcpClient.CtlState <> MSWinsockLib.StateConstants.sckClosed Then
            StatConn = False
        Else
            StatConn = True
        End If

        lblLocal.Text = "IP Address : " & tcpClient.LocalIP
        lblLocalName.Text = "Computer Name : " & tcpClient.LocalHostName


        Dim HostIP As String = txtHostIP.Text
        Select Case StatConn
            Case True
                StatLabel.Text = "Connected to " & HostIP
            Case Else
                StatLabel.Text = "Disconnected from server"
        End Select

        panelStat.Top = Me.Height - 43
        panelStat.Left = 5
    End Sub
    Private Sub tcpclient_CloseEvent(ByVal sender As Object, ByVal e As System.EventArgs) Handles tcpClient.CloseEvent
        StatConn = False
    End Sub

    Private Sub statStrip_ItemClicked(ByVal sender As System.Object, ByVal e As System.Windows.Forms.ToolStripItemClickedEventArgs) Handles statStrip.ItemClicked
    End Sub
    Private Sub tcpClient_ConnectEvent(ByVal sender As Object, ByVal e As System.EventArgs) Handles tcpClient.ConnectEvent
        tcpClient.SendData("connected")
    End Sub

    Private Sub cmdSend_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdSend1.Click
        tcpClient.SendData("AScore1" & "||" & textbox0.Text & "||" & "TextBox1.Text" & "||" & "TextBox2.Text")
    End Sub

    Private Sub tmPosition_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmPosition.Tick
        Grp2.Top = Grp1.Top + Grp1.Height + 10
        Grp3.Top = Grp2.Top + Grp2.Height + 10
        Grp4.Top = Grp3.Top + Grp3.Height + 10
        'Grp5.Top = Grp4.Top + Grp4.Height + 10
        'Grp6.Top = Grp5.Top + Grp5.Height + 10
        'Grp7.Top = Grp6.Top + Grp6.Height + 10
        'Grp8.Top = Grp7.Top + Grp7.Height + 10
        'Grp9.Top = Grp8.Top + Grp8.Height + 10
        'Grp10.Top = Grp9.Top + Grp9.Height + 10
        'Grp11.Top = Grp10.Top + Grp10.Height + 10
        'Grp12.Top = Grp11.Top + Grp11.Height + 10
        'Grp13.Top = Grp12.Top + Grp12.Height + 10
        'Grp14.Top = Grp13.Top + Grp13.Height + 10
    End Sub

    Private Sub cmdConnect_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles cmdConnect.Click
        If cmdConnect.Text = "Connect" Then
            '//Initialize Connection
            On Error Resume Next
            tcpClient.Close()
            tcpClient.Connect(txtHostIP.Text, txtPort.Text)
            cmdConnect.Text = "Disconnect"
            GroupConn.Enabled = False
        Else
            tcpClient.Close()
            cmdConnect.Text = "Connect"
            GroupConn.Enabled = True
        End If
    End Sub
End Class

P.S. disregard other code as it is for GUI purposes only.

[4hya]

I have tried to make the client to listen from server request.

but. how can I detect that a client is available for connecting and a port is open.

and. after connection, the clients and server must be closed down and reopen to be able to connect again..