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    <p>I have done something like this before. I am using LINQ to XML. I created an extension method for XElement that takes a Queue of node names, and a value for the last node in your list. Here is the extension method I made:</p> <pre><code>/// &lt;summary&gt; /// Creates nessecary parent nodes using the provided Queue, and assigns the value to the last child node. /// &lt;/summary&gt; /// &lt;param name="ele"&gt;XElement to take action on&lt;/param&gt; /// &lt;param name="nodes"&gt;Queue of node names&lt;/param&gt; /// &lt;param name="value"&gt;Value for last child node&lt;/param&gt; public static void UpdateOrCreate(this XElement ele, Queue&lt;string&gt; nodes, string value) { string previousNodeName = ""; int fullQueueCOunt = nodes.Count; for (int i = 0; i &lt; fullQueueCOunt; i++) { string node = nodes.Dequeue(); if (ele.Descendants(node).FirstOrDefault() == null) { if (!string.IsNullOrEmpty(previousNodeName)) { ele.Element(previousNodeName).Add(new XElement(node)); } else { // use main parent node if this is the first iteration ele.Add(new XElement(node)); } } previousNodeName = node; } // assign the value of the last child element ele.Descendants(previousNodeName).First().Value = value; } </code></pre> <p>And here is a sample implementation:</p> <pre><code>XElement element = XElement.Parse( "&lt;employee&gt;" + "&lt;name&gt;John Smith&lt;/name&gt;" + "&lt;/employee&gt;"); Queue&lt;string&gt; nodeQueue = new Queue&lt;string&gt;(); nodeQueue.Enqueue("address"); nodeQueue.Enqueue("city"); element.UpdateOrCreate(nodeQueue, "myValue"); </code></pre> <p>This will take the input XML:</p> <pre><code>&lt;employee&gt; &lt;name&gt;John Smith&lt;/name&gt; &lt;/employee&gt; </code></pre> <p>And change it to:</p> <pre><code>&lt;employee&gt; &lt;name&gt;John Smith&lt;/name&gt; &lt;address&gt; &lt;city&gt;myValue&lt;/city&gt; &lt;/address&gt; &lt;/employee&gt; </code></pre> <p>This will also work if the 'address' and/or 'city' nodes already exist.</p>
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    1. POHow can I create/update an XML node that may or may not exist?
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    1. USChris Knight
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