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copied!<p>You can make your property return a wrapper around the original list using <a href="http://msdn.microsoft.com/en-us/library/ms132474.aspx" rel="nofollow noreferrer"><code>ReadOnlyCollection<T></code></a>. This will ensure that callers don't add any items themselves. You can keep a reference to the original mutable list. Note that because the read-only collection is only a wrapper, callers which cache the read-only collection will still see additions that you make to the original list. That may or may not be a good thing depending on your expected use.</p> <p>EDIT: To explain my caching comment...</p> <p>Suppose a client did:</p> <pre><code>IList<ChildObject> originalChildren = container.Children; container.AddChild(new ChildObject()); IList<ChildObject> updatedChildren = container.Children; </code></pre> <p>with the <code>Children</code> property implemented like this:</p> <pre><code>private IList<ChildObject> children = new List<ChildObject>(); public IList<ChildObject> Children { get { return new ReadOnlyCollection<ChildObject>(children); } } </code></pre> <p>Then <code>originalChildren</code> and <code>updateChildren</code> would both have the same contents - the returned <code>ReadOnlyCollection</code> wouldn't be a <em>snapshot</em> of the collection of children at the first line. It would just be a <em>wrapper</em> around the collection. Clients wouldn't be able to rely on it not changing - they just wouldn't be able to change it themselves.</p>

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