Maybe this can help you:
// Validate the XML.
System.Xml.XmlValidatingReader validateReader =
new System.Xml.XmlValidatingReader(XmlContent.ToString(),
System.Xml.XmlNodeType.Document, null);
validateReader.ValidationType = System.Xml.ValidationType.Schema;
validateReader.ValidationEventHandler +=
new System.Xml.Schema.ValidationEventHandler (ValidationHandler);
while(validateReader.Read())
TM;