public static void RemoveRange <T>(this ViewableCollection <T> collection, IEnumerable items)
{
collection.BeginUpdate();
foreach (T item in items)
{
collection.Remove(item);
}
collection.EndUpdate();
}
public static void AddRange <T>(this ViewableCollection <T> collection, IEnumerable <T> items)
{
collection.BeginUpdate();
foreach (var item in items)
{
collection.Add(item);
}
collection.EndUpdate();
}