导 读：介绍了有关ASP.NET中XML控件的使用,有个小BUG:在WEBFORM.ASPX中出现的XML控件,其中的transformsource属性设定了样式表文件路径,可是在文章出处没有找到这个XSL文件.:( 自己解决吧.
在这个代码中揭示了微软在ASP.NET架构中隐藏的一个WEB表单控件，即<asp:xml runat=server/>，我只给代码，不给解释，大家自己下课后去研究吧。
另外，由于是beta1，在这个控件中你使用的xslt里面不能使用<xsl:sort>，当然，亦不能使用那个order-by了，因为它支持的xsl空间是带"1999"的那个，而不是原来的那个。
另外，我从微软得到的回答就是在beta2里面，它将支持<xsl:sort>，就可以全部转向xml+xsl了，而不用再为源代码保密问题头疼了。
请看下例：
webform2.cs
                                -
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Text;
using System.IO;
using System.Xml;

public class WebForm2 : Page
{
    public StringBuilder outputQ;
    public StringBuilder outputXml;
      public DocumentNavigator nav = null;
    public HtmlInputFile XmlFile;
    
    public System.Web.UI.WebControls.Xml MyXml;

    public System.Web.UI.WebControls.TextBox TextBox1;        
    public System.Web.UI.WebControls.TextBox TextBox2;
    public System.Web.UI.WebControls.TextBox TextBox3;        
    public System.Web.UI.WebControls.Button Query;
    public System.Web.UI.WebControls.Label FileLabel;
  
    public void On_KeyUp(object sender, System.EventArgs e)
    {
        Response.Write("Works");
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            //
            // Evals true first time browser hits the page
            //
        }
    }

    public void Query_Click(object sender, System.EventArgs e)
    {
        HttpPostedFile xmlfile = XmlFile.PostedFile;
         XmlDocument doc = new XmlDocument();    
         MyXml.Document = new XmlDocument();    
//        TextBox2.Text="";
//        TextBox3.Text="";

        if (xmlfile.FileName != String.Empty)
        {
            try
            {
                FileLabel.Text= xmlfile.FileName;

                MyXml.Document.Load(xmlfile.FileName);
                outputXml = new StringBuilder();
                XmlTextReader reader = new XmlTextReader (xmlfile.FileName);
                ShowDocument();
                TextBox3.Text = outputXml.ToString();

                outputQ = new StringBuilder();
                doc.Load(xmlfile.FileName);
                DocumentNavigator nav = new DocumentNavigator(doc);
                // Perform the query e.g. "descendant::book/price"
                XPathQuery(nav, TextBox1.Text);
                TextBox2.Text = outputQ.ToString();

            }
            catch (Exception exp) {
                //outputQ.Append("</xmp><font color="#FF6600">"+ exp.Message+"</font><xmp>");
            }
            finally {}
        }
        else if (FileLabel.Text != String.Empty)
        {
            try
            {
                MyXml.Document.Load(FileLabel.Text);
                outputXml = new StringBuilder();
                XmlTextReader reader = new XmlTextReader (FileLabel.Text);
                ShowDocument();
                TextBox3.Text = outputXml.ToString();

                ShowDocument();

                outputQ = new StringBuilder();
                doc.Load(FileLabel.Text);
                DocumentNavigator nav = new DocumentNavigator(doc);
                // Perform the query e.g. "descendant::book/price"
                XPathQuery(nav, TextBox1.Text);
                TextBox2.Text = outputQ.ToString();

            }
            catch (Exception exp) {
                outputQ.Append("</xmp><font color="#FF6600">"+ exp.Message+"</font><xmp>");
            }
            finally {}
        }
    }

    private void XPathQuery(XmlNavigator navigator, String xpathexpr )
    {
        try
        {
            // Save context node position
            navigator.PushPosition();
            navigator.Select (xpathexpr);
            FormatXml(navigator);

            // Restore context node position
            navigator.PopPosition();        
        }
        catch (Exception e)
        {
        }
    }
    
//***************************** Navigator ************************************
    private void FormatXml (XmlNavigator navigator)
    {
        while (navigator.MoveToNextSelected())
        {
  &

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