Updating XML elements content usign XDocument class

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Hi all,
I'm using the XDocument class to update the value after creating the document:

C#

        XDocument doc2 = XDocument.Parse(@"
    <kml xmlns='http://www.opengis.net/kml/2.2' xmlns:gx='http://www.google.com/kml/ext/2.2' xmlns:kml='http://www.opengis.net/kml/2.2' xmlns:atom='http://www.w3.org/2005/Atom'>
        <Placemark>
             <name>Test</name>
             <LookAt>
            <longitude>11111111111</longitude>
            <latitude>1111111111111</latitude>
            <altitude>500</altitude>
            <range>500</range>
            <tilt></tilt>
            <heading>11111111</heading>
            <altitudeMode>relativeToGround</altitudeMode>
           </LookAt>
          <styleUrl>#msn_ylw-pushpin70</styleUrl>
          <Point>
            <coordinates>111111111,1111111111</coordinates>
          </Point>
      </Placemark>
</kml>");

So I need to update the "longitude" element content so I used;

C#

doc2.Element("kml").Element("longitude").Value = "XXXXX";

I get now the exception "Object reference not set to an instance of an object"
I know that there is a problem reaching the "longitude" element so what is the method which enables me to do it, because I tried many times and searched a lot..

Many thanks.

Posted 18-Nov-12 0:13am

M.S.S.E

Updated 18-Nov-12 0:15am

v2

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Kuthuparakkal · Accepted Answer · 2012-11-18T05:11:00

Try this :

C#

using System.Xml.Linq;
using System.Xml;
using System.Xml.XPath;

XDocument doc2 = XDocument.Parse(@"
    		<kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2" xmlns:kml="http://www.opengis.net/kml/2.2" xmlns:atom="http://www.w3.org/2005/Atom">
                <placemark>
		             <name>Test</name>
			         <lookat>
				    <longitude>11111111111</longitude>
				    <latitude>1111111111111</latitude>
				    <altitude>500</altitude>
				    <range>500</range>
				    <tilt></tilt>
				    <heading>11111111</heading>
				    <altitudemode>relativeToGround</altitudemode>
			       </lookat>
			      <styleurl>#msn_ylw-pushpin70</styleurl>
			      <point>
				    <coordinates>111111111,1111111111</coordinates>
			      </point>
              </placemark>
        </kml>");

XmlNamespaceManager xnm = new XmlNamespaceManager(new NameTable()); 
xnm.AddNamespace("x", "http://www.opengis.net/kml/2.2");

var longitude = doc2.XPathSelectElement("//x:longitude", xnm);
//var longitude = doc2.XPathSelectElement("/x:kml/x:Placemark/x:LookAt/x:longitude", xnm); this also works!
longitude.Value = "XXXXX";