Warning to user if they attempt to change data on a form

I'm trying to provide a warning message to a user if they attempt to change data on an existing record via a form event.

Here is my code which give them the warning but accepts the change even if they reply "No".  What am I doing wrong?

Private Sub Form_DataChange(ByVal Reason As Long)

        If MsgBox("You are attempting to change data in an existing record. Do you wish to continue?  If so, click [Yes].  If not, click [No]", vbYesNo) = vbNo Then
        Exit Sub
        Else
        'Do nothing
        End If

End Sub

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SteveL13Asked:
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SteveL13Author Commented:
By the way, if the record is a new record I don't want the warning to appear.
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Jim Dettman (Microsoft MVP/ EE MVE)President / OwnerCommented:
The data change event is only when Pivot tables are in use.

 Use the OnDirty event.

Jim.
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PatHartmanCommented:
I concur, the Dirty event is appropriate for this requirement.  To take the explanation further.  Once you have asked the question, you need to cancel the update if they say to.
Private Sub Form_Dirty(Cancel As Integer)
    If Me.NewRecord  = True Then
        Exit Sub
    Else
        If Msgbox("Are you sure you want to update this record?", vbYesNo) = vbNo Then
            Me.Undo
            Cancel = True
            Exit Sub
        End If
    End If
End Sub

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Put your validation code in the FORM's BeforeUpdate event and then Cancel that event if you find an error but don't use Me.Undo since in that case, you don't want to remove all the changes the user made.  I also use the .SetFocus property to set focus to the control with the error and then exit immediately.  Using this technique, if they have three errors, it takes three submits to find them all but unless you create some fancy reporting mechanism, it's just simpler to report them one at a time.
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