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Task/XML-XPath/C-sharp/xml-xpath.cs

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+XmlReader XReader;
+
+// Either read the xml from a string ...
+XReader = XmlReader.Create(new StringReader("<inventory title=... </inventory>"));
+
+// ... or read it from the file system.
+XReader = XmlReader.Create("xmlfile.xml");
+
+// Create a XPathDocument object (which implements the IXPathNavigable interface)
+// which is optimized for XPath operation. (very fast).
+IXPathNavigable XDocument = new XPathDocument(XReader);
+
+// Create a Navigator to navigate through the document.
+XPathNavigator Nav = XDocument.CreateNavigator();
+Nav = Nav.SelectSingleNode("//item");
+
+// Move to the first element of the selection. (if available).
+if(Nav.MoveToFirst())
+{
+  Console.WriteLine(Nav.OuterXml); // The outer xml of the first item element.
+}
+
+// Get an iterator to loop over multiple selected nodes.
+XPathNodeIterator Iterator = XDocument.CreateNavigator().Select("//price");
+
+while (Iterator.MoveNext())
+{
+  Console.WriteLine(Iterator.Current.Value);
+}
+
+Iterator = XDocument.CreateNavigator().Select("//name");
+
+// Use a generic list.
+List<string> NodesValues = new List<string>();
+
+while (Iterator.MoveNext())
+{
+  NodesValues.Add(Iterator.Current.Value);
+}
+
+// Convert the generic list to an array and output the count of items.
+Console.WriteLine(NodesValues.ToArray().Length);