[bidaya]

يمكن هذا هو المطلوب

كود :

Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
       If ProgressBar1.Value = 100 Then
           ProgressBar1.Value = 0
           BackgroundWorker1.RunWorkerAsync()
       Else
           BackgroundWorker1.RunWorkerAsync()
       End If
   End Sub