string xmlPath;
string sResult;
// Set Xml File
xmlPath = @"C:\wsdata\dataimport.xml";
// Send XmlNode
XmlDocument doc = new XmlDocument();
XmlTextReader reader = new XmlTextReader(xmlPath);
reader.MoveToContent();
XmlNode apNode = doc.ReadNode(reader);
//Service1 is the webservice and DataXmlNodeMethod is the webmethod
Service1 proxy = new Service1();
sResult = proxy.DataXmlNodeMethod(apNode);