Chance label text threading

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I have code like this :

VB.NET

Private Sub tmrProc_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles tmrProc.Tick
       second = second + 1

       If second = 2 Then
           CekInternet()
       End If

       If second = 4 Then
           If rCek = True Then
               'cek ke server
               lblPesan.Text = "Menghubungkan ke server...."

               Dim Thread1 As New System.Threading.Thread( _
     AddressOf LoginServ)
               Thread1.Start()
           Else

           End If
       End If


   End Sub

C#

Private Sub LoginServ()

       iLogin = Server.Login(Server.ServerAddress)
       Select Case iLogin
           Case 0
               lblPesan.Text = "Sukses terkoneksi dengan server...."
               lblPesan.ForeColor = Drawing.Color.Lime
           Case 1
               lblPesan.Text = "Mengaktifkan offline mode"
               lblPesan.ForeColor = Drawing.Color.White
           Case 2
               lblPesan.Text = "Mengaktifkan offline mode"
               lblPesan.ForeColor = Drawing.Color.White
       End Select

   End Sub

when ILogin in case and update text label, error cross thread

hope you help

What I have tried:

Dim Thread1 As New System.Threading.Thread( _
AddressOf LoginServ)
Thread1.Start()

Posted 11-Aug-16 20:04pm

ulungss

Updated 11-Aug-16 20:44pm

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Bernhard Hiller · Answer 1 · 2016-08-11T20:44:00

What kind of Timer did you use? It is also unclear which call to a property of lblPesan fails. I assume that it happens in the LoginServ function: you explicitely use a different thread. But you must not access a control in a different thread than the thread in which it was created. If I assume correctly that lblPesan.Text = "Menghubungkan ke server...." in the timer event does not fail, I suggest to simply remove the creation of the thread and call LoginServ() directly.
If also the first call fails, you have to use lblPesan.Invoke(...) in all cases.