[RESOLVED] More threading issues: updating control

so, i got my threading working, using a background worker. the problem im having now is updating a text label on a form. i have a background worker running to test some state, so the background worker is set to run as long as the program is running. every time it fires, it call a function. this function will test a comport for activitity. if there is activity, i want to change a label's text. its not working, though. heres what i got:

Code:

---

Public Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        Dim j As Integer = 0
        Dim i As Integer = 0
        Debug.Print("bg worker begin")
        While i = j
            If BackgroundWorker1.CancellationPending Then
                i = 2
                e.Cancel = True
                BackgroundWorker1.Dispose()
                Debug.Print("bg worker middle")
                Exit While
            Else
                CheckForNew()
            End If
        End While
        Debug.Print("bg worker end")
    End Sub

---

and heres the function it calls:

Code:

---

Public Sub CheckForNew()
        Debug.Print("checkfornew begin")
'...stuff not related


        Dim con As OleDbConnection
        Dim constring As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & CurDir() & "\MyDb.mdb"
        con = New OleDbConnection(constring)
        Dim ds As New DataSet
        Dim da As OleDbDataAdapter
        Dim dt As DataTable
        Dim dr As DataRow
        da = New OleDbDataAdapter("SELECT * FROM tblInboxMsg where MsgStatus='New'", con)
        da.Fill(ds)
        counter = 0

        For Each dt In ds.Tables
            For Each dr In dt.Rows
                counter = counter + 1
                      Next
        Next
        Debug.Print("chekcfornew end")
form1.label10.textt = counter 'nothing happens here
    End Sub

---

ive tried using Progress changed event, as well. although the event fires, it still wont change the label.

any suggestions?

thanks
jason

Try this link: http://www.vbforums.com/showthread.php?t=498387

Also, if the ProgressChanged event doesn't change the label, perhaps the code which should change the label is incorrect. I see the Form1.Label10.Text property, which would mean that you are trying to change a label on a different form, right? If so, then you'd be better off creating a new event on your current form and handling it from the other one.

cool. got it working. thanks

You're welcome anytime. :thumb: