[RESOLVED] [2008] Can I add a TCPClient Component

[Atheist]

1.
That is because all socket code is running on a separate thread, in order to access the controls you need to use Invoke. Heres an example that will fix the problem you posted:

Private Delegate Sub StringDelegate(text As String)
 
Private Sub SetConnectionLabelText(text As String)
If Me.LblConnection.InvokeRequired Then
    Me.Invoke(New StringDelegate(AddressOf SetConnectionLabelText), text)
Else
    Me.LblConnection.Text = text
End If
End Sub

Now instead of doing:

LblConnection.Text = "Connected"

Do:

SetConnectionLabelText("Connected")

2.
If you want to send messages from the server, simply iterate through the list of connected clients and call the SendMessage method on the client you want to send a message to.

EDIT: Oh, I see that I've made a silly misstake in my code. Try it now.