Private Sub btn1_Click(ByVal sender As System.Object, ByVal e As _
  System.EventArgs) Handles btn1.Click
        pnl1.Visible = True
        pnl2.Visible = False
 
    End Sub
 
    Private Sub btn2_Click(ByVal sender As System.Object, ByVal e As _
      System.EventArgs) Handles btn2.Click
       pnl2.Visible = True 
       pnl1.Visible = False
    End Sub