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    copied!<p>I'd recommend against rolling your own hash creation function and instead rely on the in-built <code>XNodeEqualityComparer</code>'s <code>GetHashCode</code> method. This guarantees to take account of attributes and descendant nodes when creating the result and could save you some time too.</p> <p>Your code would look like the following:</p> <pre><code>XNodeEqualityComparer comparer = new XNodeEqualityComparer(); XDocument doc = XDocument.Load("XmlFile1.xml"); Dictionary&lt;int, XNode&gt; nodeDictionary = new Dictionary&lt;int, XNode&gt;(); foreach (XNode node in doc.Elements("doc").Elements("node")) { int hash = comparer.GetHashCode(node); if (nodeDictionary.ContainsKey(hash)) { // A duplicate has been found. Execute your logic here // ... } else { nodeDictionary.Add(hash, node); } } </code></pre> <p>My XmlFile1.xml is:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8" ?&gt; &lt;doc&gt; &lt;node att="A"&gt;Blah&lt;/node&gt; &lt;node att="A"&gt;Blah&lt;/node&gt; &lt;node att="B"&gt; &lt;inner&gt;Innertext&lt;/inner&gt; &lt;/node&gt; &lt;node&gt;Blah&lt;/node&gt; &lt;node att="B"&gt; &lt;inner&gt;Different&lt;/inner&gt; &lt;/node&gt; &lt;/doc&gt; </code></pre> <p><code>nodeDictionary</code> will end up containing a unique collection of Nodes and their hashes. Duplicates are detected by using the <code>Dictionary</code>'s <code>ContainsKey</code> method, passing in the hash of the node, which we generate using the <code>XNodeEqualityComparer</code>'s <code>GetHashCode</code> method.</p> <p>I think this should be fast enough for your needs.</p>
 

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