Menghitung Nilai Persegi Panjang

        Private Sub Btnproses_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btnproses.Click
        Luas.Text = Panjang.Text * Lebar.Text

    End Sub

         Private Sub Btnhapus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btnhapus.Click
        Panjang.Text = ""
        Lebar.Text = ""
        Luas.Text = ""
    End Sub
End Class