VB.net multithread on show/hide/showdialog of another form

Question

i wish to show another form under multithread
When using show, the label text on another form cannot be shown up
When using showdialog, the label text can be shown but the form cannot be hide after.

How can i fix it ? it seems more complicated in multithread. Thanks.

Private Sub clienttest_Load(sender As Object, e As EventArgs) Handles Me.Load
System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = False
Try
clientsocket.Connect("192.168.1.3", 8801)
For i = 1 To 3
Dim t As Thread = New Thread(AddressOf Receive)
t.Start(i)
Next
Catch ex As Exception
Application.Exit()
End Try
End Sub

Sub Receive(a)
    While (True)
        If clientsocket.Connected = True Then
            Dim networkstream As NetworkStream = clientsocket.GetStream()
            Dim byesFrom(25) As Byte
            networkstream.Read(byesFrom, 0, byesFrom.Length)
            Dim ServerSignal As String = System.Text.Encoding.ASCII.GetString(byesFrom)

            Select Case Microsoft.VisualBasic.Left(ServerSignal, 1)
                Case "S"   ' show Dialog
                    Me.Hide()
                    test2.Show()
                    'test2.ShowDialog()
                Case "E"  ' Resume from Dialog
                    Me.Show()
                    Me.TopMost = True
                    test2.Hide()
            End Select
        End If
    End While
End Sub

Answer 1

Try something like this:

System.Windows.Forms.Control.CheckForIllegalCrossThreadCalls = True
. . .

Sub Receive(a)
   While (True)
      If clientsocket.Connected = True Then
         . . .
         Select Case Microsoft.VisualBasic.Left(ServerSignal, 1)
            Case "S"   ' show Dialog
               Invoke(Sub()
                     Me.Hide()
                     test2.Show()
                  End Sub )
            Case "E"  ' Resume from Dialog
               Invoke(Sub()
                     Me.Show()
                     Me.TopMost = True
                     test2.Hide()
                  End Sub )
             End Select
      Else
         Thread.Sle ep(300)
      End If
   End While
End Sub

Answer 2

it is also failed by dispose another form

another form can be shown up according to the number of thread.

Answer 3

Yes, it show different thread control failed

but it need a thread to monitor signal from another computer

any advice? use backgroundworker?

Thanks a lot