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XML

Context: LINQ to XML (using System.Xml.Linq) provides a modern, in‑memory XML API with query capabilities.

using System.Xml.Linq;

XDocument doc = XDocument.Parse(@"
    <books>
        <book title='C# Programming' price='49.99'/>
        <book title='LINQ in Action' price='39.99'/>
    </books>");

var expensiveBooks = from b in doc.Descendants("book")
                     where (decimal)b.Attribute("price") > 40
                     select b.Attribute("title").Value;

Real-world usage example

Configuration file querying: Use LINQ to XML to read and filter settings from XML configuration files.

Example: LINQ to XML documentation shows many examples for querying XML.