i can't change the Label1.Text   in ProgressChanged 
i think change the Label1.Text  and excute sql and ProgressBar1 in same  time... like update software
update function is a sql , excute sql is more time to hang computer , ProgressBar1 is ok , but test is not ok .... 


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


Private Function update()
Label1.Text = "update the masterfile"
Me.ProgressBar1.Value = 10

sql statement......finish

Label1.Text = "update the materfile finish"

Me.ProgressBar1.Value = 20

Label1.Text = "update the itemfile"
Me.ProgressBar1.Value = 30

sql statement......finish

Label1.Text = "update the itemfile finish"

Me.ProgressBar1.Value = 100
end sub