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    <p>The first part of your question sounds like a schema validation would work best. If you have access to the XSD's or can create them you could use an algorithm similar to this:</p> <pre><code> public void ValidateXmlToXsd(string xsdFilePath, string xmlFilePath) { XmlSchema schema = ValidateXsd(xsdFilePath); XmlDocument xmlData = new XmlDocument(); XmlReaderSettings validationSettings = new XmlReaderSettings(); validationSettings.Schemas.Add(schema); validationSettings.Schemas.Compile(); validationSettings.ValidationFlags = XmlSchemaValidationFlags.ProcessInlineSchema; validationSettings.ValidationType = ValidationType.Schema; validationSettings.ValidationEventHandler += new ValidationEventHandler(ValidationHandler); XmlReader xmlFile = XmlReader.Create(xmlFilePath, validationSettings); xmlData.Load(xmlFile); xmlFile.Close(); } private XmlSchema ValidateXsd(string xsdFilePath) { StreamReader schemaFile = new StreamReader(xsdFilePath); XmlSchema schema = XmlSchema.Read(schemaFile, new ValidationEventHandler(ValidationHandler)); schema.Compile(new ValidationEventHandler(ValidationHandler)); schemaFile.Close(); schemaFile.Dispose(); return schema; } private void ValidationHandler(object sender, ValidationEventArgs e) { throw new XmlSchemaException(e.Message); } </code></pre> <p>If the xml fails to validate the <code>XmlSchemaException</code> is thrown.</p> <p>As for LINQ, I personally prefer to use <code>XDocument</code> whenever I can over <code>XmlDocument</code>. Your goal is somewhat subjective and without seeing exactly what you're doing I can't say go this way or go that way with any certainty that it would help you. You can use XPath with <code>XDocument</code>. I would have to say that you should use whichever suits your needs best. There's no issue with using XPath sometimes and LINQ other times. It really depends on your comfort level along with scalability and readability. What will benefit the team, so to speak.</p>
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    1. POOptimizing XML in C#
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    1. USAlexander Kahoun
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    1. COWe already use XSD validation - our main bottleneck is disk access and I would like to find a way, I guess, of randomly accessing the XML so as not to load the entire file before we use it. I suspect it won't be possible without some major rework.
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      1. USJeff Yates
 

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