List<string> PropertyValue= new List<string>();

            string xmlstr = "<?xml version=\"1.0\"?>"+
                            "<Propertys Name =\"myName\">" +
                              "<Data Value=\"11\"/>" +
                              "<Data Value=\"22\"/>" +
                              "<Data Value=\"33\"/>" +
                            "</Propertys>";

            XmlDocument xd = new XmlDocument();
            xd.LoadXml(xmlstr);

            XmlNodeList xl = xd.GetElementsByTagName("Data");

            for (int i = 0; i < xl.Count; i++)
            {
                PropertyValue.Add(xl[i].Attributes["Value"].Value);
            }

------解决方案--------------------
C# code
  List<string> value_list = new List<string>();
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(@"C:\Documents and Settings\Administrator\桌面\Test.txt");

                foreach (XmlNode xn in xmlDoc.SelectNodes("//Propertys/Data"))
                {
                    value_list.Add(xn.Attributes["Value"].Value);
                }
                /*
                 *         [0]    "11"    string
                        [1]    "22"    string
                        [2]    "33"    string

                 */

------解决方案--------------------
C# code

<?xml version="1.0" encoding="utf-8" ?>
<Propertys Name ="myName">
  <Data Value="11"/>
  <Data Value="22"/>
  <Data Value="33"/>
</Propertys>

以下是读取代码：
using System.Xml.Linq;
using System.Xml;
using System.Text;

        StringBuilder sb = new StringBuilder();
        string[] PropertyValue;
        XmlDocument xml = new XmlDocument();
        xml.Load(Server.MapPath("test.xml"));
        XmlNodeList xn = xml.SelectNodes("Propertys/Data");
        foreach (XmlNode xn1 in xn)
        {
            sb.Append(xn1.Attributes["Value"].Value+",");
        }
        PropertyValue = sb.ToString().TrimEnd(',').Split(',');
        foreach (string s in PropertyValue)
        {
            Response.Write(s+"</br>");
        }

------解决方案--------------------
探讨


C# code
  List<string> value_list = new List<string>();
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.Load(@"C:\Documents and Settings\Administrator\桌面\Test.txt");

……


------解决方案--------------------
都很详细了，，，接分。。