/// <summary>
/// Returns the values from the ListItemCollection for the items that aren't
/// selected.
/// </summary>
public static IEnumerable <string> NonSelectedValues(this ListItemCollection value)
{
var items = value.NonSelectedItems();
if (items.Count() == 0)
{
return(new Collection <string>());
}
return(items.Select(x => x.Value));
}