急急急！！！关于xml的读取和写入问题！！！

现在有一个xml文件如下<Annotations>
<Layer>
<Name>Layer1</Name>
<Visible>True</Visible>
<AnnotationCollection>
<RectangleAnnotation>
<Name>RectName</name>
<Location>100,100</Location>
<Size>100,100</Size>
<Visible>True</Visible>
<Rotation>0</Rotation>
<BackgroundColor>255,255,255,0</BackgroundColor>
</RectangleAnnotation>
<TextAnnotation>
<Name>TextAnno</Name>
<Location>100,100</Location>
<Size>100,100</Size>
<Visible>True</Visible>
<Rotation>0</Rotation>
<BackgroundColor>255,255,255,0</BackgroundColor>
<BorderColor>255,0,0,0</BorderColor>
<BorderWidth>1</BorderWidth>
<Font>
<Name>Arial</name>
<Size>12</Size>
</Font>
<FontColor>255,0,0,0</FontColor>
<Text><![CDATA[administrator at 10/06/2010 16:56:]]></text>
</TextAnnotation>
<LineAnnotation>
<Name>TextAnno</Name>
<Location>100,100</Location>
<Size>100,100</Size>
<Visible>True</Visible>
<Rotation>0</Rotation>
<Color>255,255,255,0</Color>
<Width>1</Width>
</LineAnnotation>
<FreehandAnnotaion>
<Name>TextAnno</Name>
<Location>100,100</Location>
<Size>100,100</Size>
<Visible>True</Visible>
<Rotation>0</Rotation>
<Color>255,255,255,0</Color>
<Width>1</Width>
<Points>
<Point>100,100</Point>
<Point>100,200</Point>
<Point>200,200</Point>
<Point>200,100</Point>
</Points>
</FreehandAnnotation>
</AnnotationCollection>
</Layer>
</Annotations>我想读取xml文件中节点的数据，asp.net中如何读取啊？然后写一个方法可以把一些数据写入到另外一个xml中又如何实现呢？
急！！！如果问题解决，马上给分，谢谢啊1！！