private static void SelectByTextOrValueMultiple(this SelectList selectList, Constraint constraint)
{
// This is copied from SelectList.SelectMultiple
var options = selectList.Options.Filter(constraint);
if (options.Count == 0)
{
throw new SelectListItemNotFoundException(constraint.ToString(), selectList);
}
foreach (var option in options)
{
if (option.Selected)
{
continue;
}
option.SetAttributeValue("selected", "true");
}
selectList.FireEvent("onchange");
}
