Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click BackgroundWorker1.RunWorkerAsync() Startbutton.Enabled = False Private Sub BackgroundWorker1_DoWork(sender As Object, e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork Do until System.IO.File.Exists("ABC") Loop End Sub Private Sub BackgroundWorker1_RunWorkerCompleted(ByVal sender As System.Object, ByVal e As System.ComponentModel.RunWorkerCompletedEventArgs) _ Handles BackgroundWorker1.RunWorkerCompleted Startbutton.enabled=True End Sub
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