kalkulator menggunakan keypress

Private Sub cmdbatal_Click()
txtn1 = ""
txtn2 = ""
txtn3 = ""
txtn4 = ""
txtn5 = ""
txtn6 = ""
txtn7 = ""
txtn8 = ""
txttotal1 = ""
txttotal2 = ""
txttotal3 = ""
txttotal4 = ""
txtn1.SetFocus
End Sub

Private Sub cmdhitung_Click()
txttotal1 = Val(txtn1) + Val(txtn2)
txttotal2 = Val(txtn3) / Val(txtn4)
txttotal3 = Val(txtn5) - Val(txtn6)
txttotal4 = Val(txtn7) * Val(txtn8)
End Sub

Private Sub cmdkeluar_Click()
Unload Me

End Sub

Private Sub cmdlagi_Click()
txtn1 = ""
txtn2 = ""
txtn3 = ""
txtn4 = ""
txtn5 = ""
txtn6 = ""
txtn7 = ""
txtn8 = ""
txttotal1 = ""
txttotal2 = ""
txttotal3 = ""
txttotal4 = ""
txtn1.SetFocus

End Sub


Private Sub txtn1_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
txtn2.SetFocus
End If
End Sub

Private Sub txtn2_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
txtn3.SetFocus
End If
End Sub


Private Sub txtn3_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
txtn4.SetFocus
End If
End Sub



Private Sub txtn4_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
txtn5.SetFocus
End If
End Sub



Private Sub txtn5_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
txtn6.SetFocus
End If
End Sub


Private Sub txtn6_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
txtn7.SetFocus
End If
End Sub

Private Sub txtn7_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
txtn8.SetFocus
End If

End Sub

Private Sub txtn8_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
txttotal1 = Val(txtn1) + Val(txtn2)
txttotal2 = Val(txtn3) / Val(txtn4)
txttotal3 = Val(txtn5) - Val(txtn6)
txttotal4 = Val(txtn7) * Val(txtn8)
End If
End Sub