Because the collection is read-only, you can only get this item at the specified index. An exception will occur if you try to set the item. This member is an explicit interface member implementation. It can be used only when the ReadOnlyCollection<T> instance is cast to an IList<T> interface.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)