Handlers for Form Changes

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I have a form with about 25-30 TextBoxes, ComboBoxes, etc; if the user does
not make any changes to the form I don't want to post a "Cancel Changes?"
dialog when they exit the form ... so this is what I'm doing to detect
changes:


// this gets called from the Form_Load event handler

private void SetFormStateChangeHandlers(Control parent) // on 1st
entry, "this" is passed to the method
{
foreach (Control control in parent.Controls)
{
if (control is TextBox || control is ComboBox)
{
control.TextChanged += new
EventHandler(controlStateChanged);
}

// handle container controls which might have child controls
if (control.Controls.Count > 0)
{
SetFormStateChangeHandlers(control);
}
}
}

// set the class-level var to be tested on form exit
void controlStateChanged(object sender, EventArgs e)
{
FormHasChanged = true;
}


This *does* work, but there is at least one shortcoming, which is that if
the user changes a control and then undoes the change, I'm not detecting
that ... also, I'm just wondering if there's a better, more straightforward
way of handling the issue ... any other ideas out there?

TIA
Liz



.

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