how to insert textbox value into xml using asp.net with c# langauge?

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C#

ASP.NET

Hi every one,
am newly enter in xml, i dont know whole thing , even though i know few things how do i call xml in to c# code. in this i have few douts , am developing one application using asp.net with c# language,
the concept which is nothing but the how to insert text box value into xml using c#.net ,
acually i need the below output,

my sample output is:

<?xml version="1.0" encoding="utf-8"?>
<requestblock version="3.67">
  <alias>testing</alias>
  <request type="STORE">
    <merchant>
      <orderreference>EXAMPLE CARDSTORE</orderreference>
    </merchant>
    <operation>
      <sitereference>live2</sitereference>
      <accounttypedescription>CARDSTORE</accounttypedescription>
    </operation>
    <billing>
      <town>mumbai</town>
      <street>nehru nagr</street>
      <postcode>6005432</postcode>
      <premise>564</premise>
      <payment type="VISA">
        <pan>411123445234556677</pan>
        <expirydate>10/13</expirydate>
      </payment>
      <name>
        <first>test</first>
      </name>
    </billing>
  </request>
</requestblock>

the thing is am getting the output which is in the unordered place, please find out my below code and let me know where i did mistake and give me a solution please...

Defaault.aspx.cs:

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Xml;

public partial class sendrequest : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void btnsubmit_Click(object sender, EventArgs e)
    {
        XmlDocument myxmldocument = new XmlDocument();
        myxmldocument.Load(Server.MapPath("request.xml"));
        XmlNode myxmlnode = myxmldocument.DocumentElement.FirstChild;
        XmlElement myxmlelement = myxmldocument.CreateElement("billing");
        myxmlelement.SetAttribute("town", Server.HtmlEncode(txttown.Text));
        myxmlelement.SetAttribute("street", Server.HtmlEncode(txtstreet.Text));
        myxmlelement.SetAttribute("postcode", Server.HtmlEncode(txtpostcode.Text));
        myxmlelement.SetAttribute("premise", Server.HtmlEncode(txtpremise.Text));
        myxmlelement.SetAttribute("pan", Server.HtmlEncode(txtpan.Text));
        myxmlelement.SetAttribute("expirydate", Server.HtmlEncode(txtexpiry.Text));
        myxmldocument.DocumentElement.InsertBefore(myxmlelement, myxmlnode);
        myxmldocument.Save(Server.MapPath("request.xml"));
        binddata();
        lblwelcome.Text = "Record inserted Successfully Inside the XML Fil";
        txttown.Text  = "";
        txtstreet.Text  = "";
        txtpremise.Text = "";
        txtpostcode.Text = "";
        txtpan.Text = "";
        txtexpiry.Text = ""; 
    }
    private void binddata()
    {
        XmlTextReader myxmlreader = new XmlTextReader(Server.MapPath("request.xml"));
        myxmlreader.Close();
    }
}

request.xml:

<?xml version="1.0" encoding="utf-8"?>
<requestblock version="3.67">
  <alias>testing</alias>
  <request type="STORE">
    <merchant>
      <orderreference>EXAMPLE CARDSTORE</orderreference>
    </merchant>
    <operation>
      <sitereference>live2</sitereference>
      <accounttypedescription>CARDSTORE</accounttypedescription>
    </operation>
    <billing>
      <town></town>
      <street></street>
      <postcode></postcode>
      <premise></premise>
      <payment type="VISA">
        <pan></pan>
        <expirydate></expirydate>
      </payment>
      <name>
        <first></first>
      </name>
    </billing>
  </request>
</requestblock>

the above code which was done by the mistakes output is:

<?xml version="1.0" encoding="utf-8"?>
<requestblock version="3.67">
  <billing town="chennai" street="anna nagar" postcode="600034" premise="878" pan="411111887777766723" expirydate="10/13" />
  <alias>testing</alias>
  <request type="STORE">
    <merchant>
      <orderreference>EXAMPLE CARDSTORE</orderreference>
    </merchant>
    <operation>
      <sitereference>live2</sitereference>
      <accounttypedescription>CARDSTORE</accounttypedescription>
    </operation>
    <billing>
      <town>
      </town>
      <street>
      </street>
      <postcode>
      </postcode>
      <premise>
      </premise>
      <payment type="VISA">
        <pan>
        </pan>
        <expirydate>
        </expirydate>
      </payment>
      <name>
        <first>
        </first>
      </name>
    </billing>
  </request>
</requestblock>

so please follow my code and give me a solution....


thanks in advance....