Updating GUI with backgroundworker

[goldenix]

I was hoping I can do that with timer, but its not working, like anything else I tried & all the codes I found I simply Dont understand ( Even TUTORIALS!!! why are they so complicated? ), so let ma ask for a simple example: how I make my label change?

This is what I want to do:

        For i = 0 To 1000
            System.Threading.Thread.Sleep(1000)
            Me.Label1.Text = i 
        Next

And this is the code im working on:

    Private Sub Button1_Click(ByVal sender As System.Object, _
     ByVal e As System.EventArgs) Handles Button1.Click

        Me.BackgroundWorker1.RunWorkerAsync() ' start worker

    End Sub

    Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, _
     ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork

        For i = 0 To 1000
            System.Threading.Thread.Sleep(1000)
            Me.Label1.Text = i 
        Next

    End Sub

    Private Sub BackgroundWorker1_ProgressChanged(ByVal sender As Object, _
     ByVal e As System.ComponentModel.ProgressChangedEventArgs) Handles _
      BackgroundWorker1.ProgressChanged

        ' not really shure how to use this...

    End Sub

[MaximilianMayrhofer]

While it is technically not illegal to manipulate controls across threads, this is prone to some serious errors.

Use these tutorials by jmc, I found them invaluable when getting acquainted with the BGW.

Using the Background Worker Component

Accessing Controls from Worker Threads