easiest way to display xml tree structure in aspx

I need the easiest way to display xml tree structure in aspx - nothing fancy!

this is my xml - which i am reading from a file on the hdd

<?xml version="1.0" encoding="utf-8" standalone="yes"?>

<citizenvitalsign>
  <citizenid>v56456</citizenid>
  <logopendate>2011-05-05</logopendate>
  <logexpiredate>2011-05-20</logexpiredate>
  <vitalsigns>
    <vitalsigndate>2011-05-04</vitalsigndate>
    <vitalsignstime>12:34:23</vitalsignstime>
    <signs>
      <oximeter>
        <saturationlevel>56</saturationlevel>
        <heartrate>84</heartrate>
      </oximeter>
      <weigth>
        <weigthingrams>75100</weigthingrams>
      </weigth>
      <ecg>
        <ecgvalues>
          <value>0.00432</value>
          <value>0.00532</value>
          <value>0.00832</value>
          <value>0.00432</value>
          <value>0.00532</value>
          <value>0.00832</value>
        </ecgvalues>
      </ecg>
      <bloodpressure>
        <systolic>78</systolic>
        <diastolic>123</diastolic>
        <heartrate>89</heartrate>
      </bloodpressure>
    </signs>
  </vitalsigns>
  <vitalsigns>
    <vitalsigndate>2011-05-05</vitalsigndate>开发者_运维知识库;
    <vitalsignstime>10:35:23</vitalsignstime>
    <signs>
      <oximeter>
        <saturationlevel>56</saturationlevel>
        <heartrate>84</heartrate>
      </oximeter>
      <ecg>
        <ecgvalues>
          <value>0.004456</value>
          <value>0.00532</value>
          <value>0.000434</value>
          <value>0.00489</value>
          <value>0.005122</value>
          <value>0.008122</value>
        </ecgvalues>
      </ecg>
      <bloodpressure>
        <systolic>85</systolic>
        <diastolic>111</diastolic>
        <heartrate>90</heartrate>
      </bloodpressure>
    </signs>
  </vitalsigns>

If the whole contents of the aspx is the XML content:

Just output a application/xml (or text/xml, though see the link in the comment by @jasso first) content type header with your XML and let the browser show the XML in the native way.

Most browsers already show XML in a tree structure natively.

If you want to output it as part of the page output, with other content, I would pass the XML through an XML pretty printer and then HTML encode it for output.

You can use Literal control along with Server.HtmlEncode to show the xml.

Example here: Display XML on an ASP.NET page