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    <p>This is how I would do it to cover a list of Nodes no matter how deep it is:</p> <p>The Node class:</p> <pre><code>public class Node { public Guid Id { get; set; } public DateTime Created { get; set; } public List&lt;Node&gt; Nodes { get; set; } public Node() { this.Nodes = new List&lt;Node&gt;(); } public List&lt;Node&gt; FindNodes(Func&lt;Node, bool&gt; condition) { List&lt;Node&gt; resList = new List&lt;Node&gt;(); if (this.Nodes != null &amp;&amp; this.Nodes.Count &gt; 0) { this.Nodes.ForEach(x =&gt; { resList.AddRange(x.FindNodes(condition)); if (condition(x)) resList.Add(x); } ); } return resList; } } </code></pre> <p>Having this list of Nodes for example:</p> <pre><code>List&lt;Node&gt; nodeList = new List&lt;Node&gt;() { new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 01, 10), Nodes = { new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 01, 11) }, new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 01, 12) } } }, new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 02, 10), Nodes = { new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 02, 11), Nodes = { new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 11, 11) }, new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 12, 12), Nodes = { new Node() { Id = Guid.NewGuid(), Created = new DateTime(2011, 11, 11) }, new Node() { Id = Guid.NewGuid(), Created = new DateTime(2011, 12, 12) } } } } }, new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 02, 12) } } }, new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 03, 10), Nodes = { new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 03, 11) }, new Node() { Id = Guid.NewGuid(), Created = new DateTime(2009, 03, 12) } } }, }; </code></pre> <p>I can find any sub-node I want like that:</p> <pre><code>List&lt;Node&gt; resList = new List&lt;Node&gt;(); nodeList.ForEach(x =&gt; resList.AddRange(x.FindNodes(y =&gt; y.Created.Day == 12))); </code></pre> <p>You can look by anything you want to. In the above example I search for nodes that are Created on the 12th day of any month and year.</p>
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    1. COthanks for the example and code tolism7 it works as you have said (I can stop banging my head against the desk now). One issue I have once I find the node I want I then need to add the current node as a subnode item. what would be a good way to do this as your findnodes function returns a new list rather than a reference within main list of the selected node (I have updated my question with the full code.
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    2. COThe elements within the return list are not new Node objects. The elements are just references to the found nodes so you should be able to add chiled nodes to them without any problems. If I where you I would try Konstantin's (see his answer) solution and I would replace the line: result.ForEach(x => x.FindNodes(y => y.Id.Equals(item.ParentId)).FirstOrDefault().Nodes.Add(item)); with: result.SelectMany(n => n.AllNodes).First(n => n.Id.Equals(item.ParentId)).Nodes.Add(item); and see how that would work. P.S. you do not need the ref keyword on the second paramenter of your method.
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