access xml-nodes from xml file

Hello,

how can i access a node of a xml-file

looks like this:

<RootNode>

     <EntryNode>

          <ColumnA>Some Value A</ColumnA>

          <ColumnB>Some Value B</ColumnB>

     </EntryNode>

     <EntryNode>

          <ColumnA>Some Value C</ColumnA>

          <ColumnB>Some Value D</ColumnB>

     </EntryNode>

</RootNode>

thanks for your help