Select XML Node

Hi,
i am doing a VB.NET Windows Application. In that i am trying to select a node from XML File and add child nodes to that selected node. My XML File looks like this

<?xml version="1.0" encoding="utf-8"?>
<csRoot>
<CS>
<CardCode>CC6</CardCode>
<Version>1.1</Version>
<MF BS="3820" FID="3F00" AC="0000" KN="0000" />
</CS>
<CS>
<CardCode>CC6</CardCode>
<Version>1.0</Version>
<MF BS="3820" FID="3F00" AC="0000" KN="0000" />
</CS>
<CS>
<CardCode>CC7</CardCode>
<Version>3.2</Version>
<MF BS="3820" FID="3F00" AC="0000" KN="0000" />
</CS>
</csRoot>

Here i want to select the node whose CardCode is CC6 and Version is 1.0.
How i should write the code for this .. Also after selecting that i want to create a child node for that MF with attributes BS, FI, AC, KN etc. Can anybody help me in doing this .. plz