XmlDocument and XmlDataSource

[yehia]

Hello,

i want to read the contents of an xml files located on the server, i
don't need to change or modify anything in the xml, so i'm faced with
using the XmlDocument and the SelectSingleNode method or the
XmlDataSource using its XPath property, so i was wondering if there is
any difference between the two, performance and resource wise?

Thanks
Yehia