Hallo,
habe es selber gelöst:
string xmlFileName = "test.xml";
System.IO.Stream xsdresource = System.Reflection.Assembly.GetExecutingAssembly().GetManifestResourceStream("Namespace.test.xsd");
XmlReaderSettings settings = new XmlReaderSettings();
settings.ValidationType = ValidationType.Schema;
settings.Schemas.Add(null, XmlReader.Create(xsdresource));
XmlReader xmlReader = XmlReader.Create(new XmlTextReader(xmlFileName), settings);
try
{
XDocument xdoc = XDocument.Load(xmlReader);
MessageBox.Show(xdoc.ToString());
}
catch (XmlSchemaValidationException ex)
{
MessageBox.Show(ex.Message);
}