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copied!<p>Something like this? (I tried to base it on your code):</p> <pre><code>LinkedList<BD> list = new LinkedList<BD>(b[arg].Values); LinkedListNode<BD> node = list.Last; LinkedListNode<BD> terminator = null; while (node != null && node != terminator) { if (IDs.Contains(node.Value.DocumentVersionId)) { LinkedListNode<BD> tempNode = node; node = node.Previous; list.Remove(tempNode); list.AddFirst(tempNode); if (terminator == null) terminator = tempNode; } else { node = node.Previous; } } </code></pre> <p>This piece of code should move your "DocumentVersionId-matched" nodes to the front of the linked list.</p> <p>Below is an example with simple integers to demonstrate how it works:</p> <pre><code>List<int> specials = new List<int> { 1, 4, 5, 7 }; List<int> source = new List<int> { 1, 2, 3, 4, 5, 6, 7, 8 }; LinkedList<int> list = new LinkedList<int>(source); LinkedListNode<int> node = list.Last; LinkedListNode<int> terminator = null; while (node != null && node != terminator) { if (specials.Contains(node.Value)) { LinkedListNode<int> tempNode = node; node = node.Previous; list.Remove(tempNode); list.AddFirst(tempNode); if (terminator == null) terminator = tempNode; } else { node = node.Previous; } } </code></pre> <p>The result linked list will contain:<br> 1, 4, 5, 7 (the specials at the beginning of the linked list), 2, 3, 6, 8</p> <p>An endless loop should be impossible.</p> <p><strong>Answer edits:</strong><br> - <em>node = list.First</em> to <em>node = list.Last</em><br> - added an example with integers</p>

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