What is the best way to send and receive xml data via POST to server

Hi all,

I need to send POST of some xml data and the server will respond afer checking some parameters for validation. Currently i'm using XmlReader class inside System.Xml reference. From what i know, this XmlReader is actually iterating thru all the nodes in the XML file and stop at my specified nodes to retrieve string/text data. Is this efficient in terms of performance or is there any other means that do not require the cursor to go thru all the nodes Maybe can jump straight to the intended node/nodes and retrieve content.
Help from u guys out there much appreciated. Thanks.

Regards.