In form prevent saving record if a field is not completed

I cannot change my table design now to require that a specific field be completed.
My form is a is a multiple item form.
How can I on form design level prevent a record from updating if the user do not enter a value in that specific field.
Can you help me with validation method or VBA please.
Fritz PaulAsked:
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Anders Ebro (Microsoft MVP)Microsoft DeveloperCommented:
In the forms beforeUpdate Event you can cancel the update.
Private Sub Form_BeforeUpdate(Cancel as Integer)
  If Me.NameOfBoundControl & ""="" Then 'Control is empty
    Msgbox "The ZZZ must be entered"
  End If
End Sub

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Fritz PaulAuthor Commented:
OK that's nice. Thanks
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