public Enumerator(UserCollection collection)
 {
     this.wrapped = ((System.Collections.CollectionBase)collection).GetEnumerator();
 }
 /// <summary>
 /// Initializes a new instance of the UserCollection class, containing elements
 /// copied from another instance of UserCollection
 /// </summary>
 /// <param name="items">
 /// The UserCollection whose elements are to be added to the new UserCollection.
 /// </param>
 public UserCollection(UserCollection items)
 {
     this.AddRange(items);
 }