Loading data from xml to dataset using readxml method is not working

Hi All,
I am using one web service in my web application (asp.net) which returns the reply in xml string in my code behind page. It is quite big and the format is as mentioned below. Some element can have three child elements and some could have five elements. I want to read data from XML to dataset. Just wondering, first of all, is it possible for the following format. If yes then how. I tried googling but every example shows well formed xml which can be visulised in tabular form. any suggestion,example or link would be appreciated. Thanks for your time and help.
 
<rootnode>
 <node1>
           <id>1 </id>
           <name> test</name>
</node1>
 
<node2>
           <id>2</id> ...