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    copied!<p>I'm assuming that the function is actually named <code>FindChildrenById</code>, otherwise I can't see any recursion going on.</p> <p>Under this assumption you can either use exceptions (which I would strongly recommend against), or return a <code>KeyValuePair&lt;bool, IEnumerable&lt;Node&gt;&gt;</code> where the <code>bool</code> part will be used to signal an early out up the chain.</p> <p>Then, on the API level, expose a wrapper method that simply returns the <code>IEnumerable&lt;Node&gt;</code> part and throws way the <code>bool</code> part.</p> <p>Here's an example, given the class <code>Node</code>:</p> <pre><code>public class Node { List&lt;Node&gt; children; public string Text { get; set; } public List&lt;Node&gt; Children { get { return children ?? (children = new List&lt;Node&gt;()); } } } </code></pre> <p>You can traverse and shortcut like this:</p> <pre><code>public class NodeTraverser { private static KeyValuePair&lt;bool, IEnumerable&lt;Node&gt;&gt; GetChildrenById(string text, Node node) { if(node.Text == text) { return new KeyValuePair&lt;bool,IEnumerable&lt;Node&gt;&gt;(true, node.Children); } foreach(var child in node.Children) { var result = GetChildrenById(text, child); if(result.Key) { return result; // early out } } return new KeyValuePair&lt;bool,IEnumerable&lt;Node&gt;&gt;(false, Enumerable.Empty&lt;Node&gt;()); } public static IEnumerable&lt;Node&gt; FindChildrenbyId(string text, Node root) { return GetChildrenById(text, root).Value; } } </code></pre>
 

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