public static DateTimePicker BindValueTo(this DateTimePicker src, Action <DateTime?> action, CheckBox enabled = null, ControlListenGroup clg = null)
{
void evt() => action(src.GetValue(enabled));
src.ValueChanged += (s, e) => evt();
if (enabled != null)
{
enabled.CheckedChanged += (e, s) => evt();
}
evt();
src.Listen(clg);
enabled?.Listen(clg);
return(src);
}