program input harga foto copy

ini dia , program input harga foto copy :

Public Class Form1

    Private Sub btnproses_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnproses.Click
        If Jumlahlembar.Text >= 200 Then
            hargaperlembar.Text = 90
        Else
            hargaperlembar.Text = 100
        End If
        totalharga.Text = hargaperlembar.Text * Jumlahlembar.Text
        If totalharga.Text > 500000 Then
            diskon.Text = 0.15 * totalharga.Text
        Else
            diskon.Text = 0
        End If
        Pembayaran.Text = totalharga.Text - diskon.Text
    End Sub

    Private Sub btnhapus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnhapus.Click
        Jumlahlembar.Text = ""
        hargaperlembar.Text = ""
        totalharga.Text = ""
        diskon.Text = ""
        Pembayaran.Text = ""
    End Sub

    Private Sub btnkeluar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnkeluar.Click
        End
    End Sub
End Class