public static void Main()
string xmlString = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>";
xmlString += "<rootNode xmlns:ss=\"http://www.w3.org/2001/XMLSchema-instance\">";
xmlString += "<Cell ss:StyleID=\"s69\"><Data ss:Type=\"Number\">1</Data></Cell>";
xmlString += "<Cell ss:StyleID=\"s69\"><Data ss:Type=\"Number\">340054288</Data></Cell>";
xmlString += "<Cell ss:StyleID=\"s69\"><Data ss:Type=\"String\">ИВАНОВ К. С.</Data></Cell>";
xmlString += "<Cell ss:StyleID=\"s69\"><Data ss:Type=\"String\">НОВОСТРОЙКА 28 ГА</Data></Cell>";
xmlString += "</rootNode>";
XmlDocument doc = new XmlDocument();
XmlNode root = doc.DocumentElement;
using(XmlNodeList nodeList = root.SelectNodes("//Row/Cell")){
foreach(XmlNode node in nodeList){
Console.WriteLine("innerText: " + node.InnerText + ", argument[0]: " + node.Attributes[0].Value);