2 macros in one sheet targeting same cells

This is probably a really 'newbie' question but in all honesty, I'm new to macros and need some assistance.

I have a macro written to automatically add a date/time stamp to cell AB10 if cell AA10 shows "Approved". This macro also automatically deletes the contents of AB10 & AC10 if AA10 is blank.

I now need to also make the entire row lock once cell AA10 shows Approved and once there is a value (from a predetermined drop down list) in cell AC10.

This is my existing macro:


Private Sub Worksheet_Change(ByVal Target As Excel.Range)
With Target
If .Count > 1 Then Exit Sub
If Not Intersect(Range("AA10:AA10000"), .Cells) Is Nothing Then
Application.EnableEvents = False
If IsEmpty(.Value) Then
.Offset(0, 1).ClearContents
.Offset(0, 2).ClearContents
Else
With .Offset(0, 1)
.NumberFormat = "dd mmm yyyy hh:mm"
.Value = Now
End With
End If
Application.EnableEvents = True
End If
End With
End Sub

Can someone show me how to add the necessary code to lock the row as required above? Everything I've tried to add just disables the macro above.

Sincere thanks for any help that you can provide!