Query for unique id with XDocument

Question

I have the following XML name Sample.xml which I am trying to query uniqueID with XDocument:
<Request>
<Person xmlns="http://CompanyName.AppName.version1" uniqueID="3221">
<AccountNo>83838</AccountNo>
<FirstName>Tom</FirstName>
<LastName>Jackson</LastName>
</Person>
<Person xmlns="http://CompanyName.AppName.version1" uniqueID="21132">
<AccountNo>789875</AccountNo>
<FirstName>Chris</FirstName>
<LastName>Smith</LastName>
</Person>
</Request>
How do i write code to extract uniqueID of all person please help 

Answer 1

Try this:
XDocument xd = ...
var result = xd
.Root
.Elements( "{http://CompanyName.AppName.version1}Person" )
.Select( p => p.Attribute( "uniqueID" ).Value );
If you need immediately an array or list, then also call
ToArray() or ToList().