public static void mSelectSingleNode_InnerText ()
{
/* File */
var xDoc = new System.Xml.XmlDocument();
xDoc.Load(@"CustomersOrdwes.xml");
/* Node(Single) */
string sXPath= @"[CustomerID='GREAL']/CompanyName";
Console.WriteLine(xDoc.SelectSingleNode(sXPath).InnerText);
}