The XmlTextReader class found in the System.Xml assembly offers a powerful way to traverse XML documents in a forward-only, non-cached manner. However, it cannot be used on its own to validate XML documents against DTDs or XML schemas. This example provides a reusable class named Validator that can be used to validate XML documents using the XmlValidatingReader in the System.Xml namespace. Any errors found during the validation process can optionally be logged to a file. This particular example validates against an XSD schema and will fail because the XML document contains an invalid element named "golfer1."

This sample is from the book XML for ASP.NET Developers by Dan Wahlin (Sams Publishing)