How to load an XML string to Dataset

Example
<News>
<Newscols>
<Title> </title>
<Content> </content>
</Newscols>
</News>
The above is a string, how to load it to Dataset
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Dataset. readxml ()
Base on. NET 2.0
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Something like
String S = ".........";
System. Io. stringreader reader = new system. Io. stringreader (s );
Dataset DS = new dataset ();
DS. readxml (Reader );
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String STR = @ "<News>
<Newscols>
<Title> </title>
<Content> </content>
</Newscols>
</News> ";
// Transfer XML string to Dataset
String newline = system. environment. newline;
String S = Str. Replace (newline ,"");
System. Io. stringreader reader = new system. Io. stringreader (s );
Dataset DS = new dataset ();
DS. readxml (reader as system. Io. textreader );
Reader. Close ();