[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...

[Bulldog]

If its a TextBox then set a flag in the text changed event;

    Dim SomethingHasChanged As Boolean = False
    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) _
    Handles TextBox1.TextChanged
        SomethingHasChanged = True
    End Sub

The principle is the same for Radiobuttons and Checkboxes.

[zuperman]

If its a TextBox then set a flag in the text changed event;

    Dim SomethingHasChanged As Boolean = False
    Private Sub TextBox1_TextChanged(ByVal sender As System.Object, _
    ByVal e As System.EventArgs) _
    Handles TextBox1.TextChanged
        SomethingHasChanged = True
    End Sub

The principle is the same for Radiobuttons and Checkboxes.

thsta not an option when you have a lot of controls... im searching the board and found this:
http://www.vbforums.com/showpost.php...11&postcount=6

seems cool...

[Bulldog]

Yes, if you have a lot of controls then that post shows a good solution.