Socket Exception is : The operation is not allowed on non-connected sockets.

[keithseah]

Hi all,

i've been having this problem and its kiiling me! i'm a newbie at this so i hope someone would be able to help me.

picture link: http://i98.photobucket.com/albums/l2...plication2.jpg

this pops up whenever i click on the Disconnect button after i have connected.

these are the following codes for the program.

Imports SN = System.Net
Imports SNS = System.Net.Sockets
Imports ST = System.Text
Imports System.Net
 
Public Class _Default
    Dim tcpClient As New System.Net.Sockets.TcpClient
    Dim connectport As String
 
    Sub dc(ByVal tcpclient As SNS.TcpClient)
        Dim NetworkStream As SNS.NetworkStream = tcpclient.GetStream
        tcpclient.Client.Close()
        NetworkStream.Close()
        msg("Disconnected from port:" + connectport)
        status("IP:" + "Disconnected" + vbCrLf + "Port:" + "Disconnected")
    End Sub
 
    Private Sub dcBtn_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles dcBtn.Click
        Try
            dc(tcpClient)
        Catch ex As Exception
            msg("Socket Exception is : " & ex.Message)
        End Try
    End Sub
 
End Class
 
Partial Class _Default
    Inherits System.Web.UI.Page
 
    Sub msg(ByVal message As String)
        Msgbox.Text = Msgbox.Text + message + vbCrLf
    End Sub
 
    Sub status(ByVal message As String)
        statusbox.Text = message + vbCrLf
    End Sub
    Sub outputconnect(ByVal tcpclient As SNS.TcpClient)
        'Input IP Address and TCP port
        Dim address As String
        Dim port As String
        address = ipbox.Text
        port = portbox.Text
        connectport = portbox.Text
 
        If tcpclient.Connected = False Then
            tcpclient.Connect(address, port)
            msg("Connected to IP:" + address + " via port:" + port)
            status("IP:" + address + vbCrLf + "Port:" + port)
        End If
    End Sub
 
 
    Private Sub connectBtn_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles connectBtn.Click
        tcpClient = New System.Net.Sockets.TcpClient
        Try
            outputconnect(tcpClient)
        Catch ex As Exception
            msg("Socket Exception is : " & ex.Message)
        End Try
    End Sub
End Class

I hope someone would be able to help me, i would really appreciate it!

Keith.

[dafodil]

The exception clearly states that you should not try to disconnect unconnected sockets. Instead of declaring new sockets to disconnect, I suggest try to use you're old TcpClient connection.

[Frinavale]

Check if the TcpClient is closed before attempting to use it.

[keithseah]

How do i check if my TcpClient is closed or how do i use my old TcpClient?
Sorry i'm really new at this so i dont even know the basics.

[Frinavale]

Use the TcpClient.Connected property to check whether the underlying Socket for the TcpClient is connected to a remote host.

Cheers!

-Frinny