Tim Van Wassenhove

Here are a couple of methods that are missing on ObservableCollection<T>:

public static class ObservableCollectionExtensions
{
 public static void AddRange<t>(this ObservableCollection<t> observableCollection, IEnumerable<t> elements)
 {
  foreach (var element in elements) observableCollection.Add(element);
 }

 public static ObservableCollection<t> Create<t>(IEnumerable<t> elements)
 {
  var observableCollection = new ObservableCollection<t>();
  observableCollection.AddRange(elements);
  return observableCollection;
 }
}