Select an element from xml file using where clause

Here is the sample xml file

<?xml version="1.0" encoding="utf-8" ?>
<urls>
<url keyword="RA">http://google.com </url>
<url keyword="NC">http://google.com </url>
</urls>

Here is the sample code

XDocument doc=XDocument.Load(Server.MapPath("~/urllist.xml"));
var url = (from ur in doc.Descendants("url")
where ur.Attribute("keyword").Value=="RA"
select ur.Value).ToList();

Get number of element of specific name in a xml file

XmlDocument xdoc = new XmlDocument();
xdoc.Load(Server.MapPath("~/pp1.xml"));
string PersonCount = xdoc.DocumentElement.SelectNodes("//persons/person").Count.ToString();
Response.Write(PersonCount);