// Read the XML document back in.
// Create new FileStream to read schema with.
System.IO.FileStream fsReadXml = new System.IO.FileStream
(xmlFilename, System.IO.FileMode.Open);
// Create an XmlTextReader to read the file.
System.Xml.XmlTextReader myXmlReader =
new System.Xml.XmlTextReader(fsReadXml);
// Read the XML document into the DataSet.
newDataSet.ReadXml(myXmlReader);
// Close the XmlTextReader
myXmlReader.Close();