Reading a value from XML file.

private void btnLoad_Click(object sender, System.EventArgs e)
    {
      XmlTextReader reader = new XmlTextReader(
        Server.MapPath("mycompany.xml"));
      
      reader.WhitespaceHandling = WhitespaceHandling.None;
      XmlDocument xmlDoc = new XmlDocument();
      //Load the file into the XmlDocument

      xmlDoc.Load(reader);
      //Close off the connection to the file.

      reader.Close();
      //Add and item representing the document to the listbox

      lbNodes.Items.Add("XML Document");
      //Find the root nede, and add it togather with its childeren

      XmlNode xnod = xmlDoc.DocumentElement;
      AddWithChildren(xnod,1);
    }
    
    private void AddWithChildren(XmlNode xnod, Int32 intLevel)
    {
      //Adds a node to the ListBox, togather with its children.

      //intLevel controls the depth of indenting

      XmlNode xnodWorking;
      String strIndent = new string(' ',2 * intLevel);
      //Get the value of the node (if any)

      string strValue = (string) xnod.Value;
      if(strValue != null)
      {
        strValue = " : " + strValue;
      }
      //Add the node details to the ListBox

      lbNodes.Items.Add(strIndent + xnod.Name + strValue);

      //For an element node, retrive the attributes

      if (xnod.NodeType == XmlNodeType.Element)
      {
        XmlNamedNodeMap mapAttributes = xnod.Attributes;
        //Add the attributes to the ListBox

        foreach(XmlNode xnodAttribute in mapAttributes)
        {
          lbNodes.Items.Add(strIndent + " " + xnodAttribute.Name + 
            " : " + xnodAttribute.Value);
        }
        //If there are any child node, call this procedrue recursively

        if(xnod.HasChildNodes)
        {
          xnodWorking = xnod.FirstChild;
          while (xnodWorking != null)
          {
            AddWithChildren(xnodWorking, intLevel +1);
            xnodWorking = xnodWorking.NextSibling;
          }
        }
      }
    }
  }