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    <p>Okay... I finally opted with a pure C# solution to compare the two XML files, without using the XML Diff/Patch .dll and without even needing to use XSL transforms. I will be needing XSL transforms in the next step though, to convert the Xml into HTML for viewing purposes, but I have figured an algorithm using nothing but System.Xml and System.Xml.XPath.</p> <p>Here is my algorithm:</p> <pre><code>private void CompareXml(string file1, string file2) { // Load the documents XmlDocument docXml1 = new XmlDocument(); docXml1.Load(file1); XmlDocument docXml2 = new XmlDocument(); docXml2.Load(file2); // Get a list of all player nodes XmlNodeList nodes1 = docXml1.SelectNodes("/Stats/Player"); XmlNodeList nodes2 = docXml2.SelectNodes("/Stats/Player"); // Define a single node XmlNode node1; XmlNode node2; // Get the root Xml element XmlElement root1 = docXml1.DocumentElement; XmlElement root2 = docXml2.DocumentElement; // Get a list of all player names XmlNodeList nameList1 = root1.GetElementsByTagName("Name"); XmlNodeList nameList2 = root2.GetElementsByTagName("Name"); // Get a list of all teams XmlNodeList teamList1 = root1.GetElementsByTagName("Team"); XmlNodeList teamList2 = root2.GetElementsByTagName("Team"); // Create an XmlWriterSettings object with the correct options. XmlWriter writer = null; XmlWriterSettings settings = new XmlWriterSettings(); settings.Indent = true; settings.IndentChars = (" "); settings.OmitXmlDeclaration = false; // Create the XmlWriter object and write some content. writer = XmlWriter.Create(StatsFile.XmlDiffFilename, settings); writer.WriteStartElement("StatsDiff"); // The compare algorithm bool match = false; int j = 0; try { // the list has 500 players for (int i = 0; i &lt; 500; i++) { while (j &lt; 500 &amp;&amp; match == false) { // There is a match if the player name and team are the same in both lists if (nameList1.Item(i).InnerText == nameList2.Item(j).InnerText) { if (teamList1.Item(i).InnerText == teamList2.Item(j).InnerText) { match = true; node1 = nodes1.Item(i); node2 = nodes2.Item(j); // Call to the calculator and Xml writer this.CalculateDifferential(node1, node2, writer); j = 0; } } else { j++; } } match = false; } // end Xml document writer.WriteEndElement(); writer.Flush(); } finally { if (writer != null) writer.Close(); } } </code></pre> <p>XML Results:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;StatsDiff&gt; &lt;Player Rank="1"&gt; &lt;Name&gt;Sidney Crosby&lt;/Name&gt; &lt;Team&gt;PIT&lt;/Team&gt; &lt;Pos&gt;C&lt;/Pos&gt; &lt;GP&gt;0&lt;/GP&gt; &lt;G&gt;0&lt;/G&gt; &lt;A&gt;0&lt;/A&gt; &lt;Points&gt;0&lt;/Points&gt; &lt;PlusMinus&gt;0&lt;/PlusMinus&gt; &lt;PIM&gt;0&lt;/PIM&gt; &lt;PP&gt;0&lt;/PP&gt; &lt;SH&gt;0&lt;/SH&gt; &lt;GW&gt;0&lt;/GW&gt; &lt;OT&gt;0&lt;/OT&gt; &lt;Shots&gt;0&lt;/Shots&gt; &lt;ShotPctg&gt;0&lt;/ShotPctg&gt; &lt;ShiftsPerGame&gt;0&lt;/ShiftsPerGame&gt; &lt;FOWinPctg&gt;0&lt;/FOWinPctg&gt; &lt;/Player&gt; &lt;Player Rank="2"&gt; &lt;Name&gt;Steven Stamkos&lt;/Name&gt; &lt;Team&gt;TBL&lt;/Team&gt; &lt;Pos&gt;C&lt;/Pos&gt; &lt;GP&gt;1&lt;/GP&gt; &lt;G&gt;0&lt;/G&gt; &lt;A&gt;0&lt;/A&gt; &lt;Points&gt;0&lt;/Points&gt; &lt;PlusMinus&gt;0&lt;/PlusMinus&gt; &lt;PIM&gt;2&lt;/PIM&gt; &lt;PP&gt;0&lt;/PP&gt; &lt;SH&gt;0&lt;/SH&gt; &lt;GW&gt;0&lt;/GW&gt; &lt;OT&gt;0&lt;/OT&gt; &lt;Shots&gt;4&lt;/Shots&gt; &lt;ShotPctg&gt;-0,6000004&lt;/ShotPctg&gt; &lt;ShiftsPerGame&gt;-0,09999847&lt;/ShiftsPerGame&gt; &lt;FOWinPctg&gt;0,09999847&lt;/FOWinPctg&gt; &lt;/Player&gt; [...] &lt;/StatsDiff&gt; </code></pre> <p>I have spared to show the implementation for the CalculateDifferential() method, it is rather cryptic but it is fast and efficient. This way I could obtain the results wanted without using any other reference but the strict minimum, without having to use XSL...</p>
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