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copied!<p>It depends on the size; for small to mid size xml, a DOM such as <a href="http://msdn.microsoft.com/en-us/library/system.xml.xmldocument.aspx" rel="noreferrer">XmlDocument</a> (any C#/.NET versions) or <a href="http://msdn.microsoft.com/en-us/library/system.xml.linq.xdocument.aspx" rel="noreferrer">XDocument</a> (.NET 3.5/C# 3.0) is the obvious winner. For using xsd, You can load xml using an <a href="http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.aspx" rel="noreferrer">XmlReader</a>, and an XmlReader accepts (to <a href="http://msdn.microsoft.com/en-us/library/system.xml.xmlreader.create.aspx" rel="noreferrer">Create</a>) an <a href="http://msdn.microsoft.com/en-us/library/system.xml.xmlreadersettings.aspx" rel="noreferrer">XmlReaderSettings</a>. The XmlReaderSettings objects has a <a href="http://msdn.microsoft.com/en-us/library/system.xml.xmlreadersettings.schemas.aspx" rel="noreferrer">Schemas</a> property that can be used to perform xsd (or dtd) validation.</p> <p>For writing xml, the same things apply, noting that it is a little easier to lay out content with LINQ-to-XML (XDocument) than the older XmlDocument.</p> <p>However, for huge xml, a DOM may chomp too much memory, in which case you might need to use XmlReader/XmlWriter directly.</p> <p>Finally, for manipulating xml you may wish to use <a href="http://msdn.microsoft.com/en-us/library/system.xml.xsl.xslcompiledtransform.aspx" rel="noreferrer">XslCompiledTransform</a> (an xslt layer).</p> <p>The alternative to working with xml is to work with an object model; you can use <a href="http://msdn.microsoft.com/en-us/library/x6c1kb0s.aspx" rel="noreferrer">xsd.exe</a> to create classes that represent an xsd-compliant model, and simply load the xml <em>as objects</em>, manipulate it with OO, and then serialize those objects again; you do this with <a href="http://msdn.microsoft.com/en-us/library/system.xml.serialization.xmlserializer.aspx" rel="noreferrer">XmlSerializer</a>.</p>

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