ASP.NET中的XML表单控件

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(""+ exp.Message+"