[RESOLVED] Detect changes

[zuperman]

How do you manage to detect changes in a details form, so when the user press the cancel button you ask him if he wants to save changes?

this is what im doing:

''' <summary>
    ''' Determines whether this instance has changed.
    ''' </summary>
    ''' <returns>
    ''' <c>true</c> if this instance has changed; otherwise, <c>false</c>.
    ''' </returns>
    Private Function hasChanged() As Boolean
        Dim objCArHabLit As New CARHabLit
        With objCArHabLit
            .Id = Me.txtId.Text
            .Designacao = Me.txtDesignacao.Text
        End With
        If objCArHabLit.CompareTo(_objCARHabLit) <> 0 Then
            Return True
        End If
        Return False
    End Function

comments please...