XML simple Read and write----ASP script

The xml| script is known to have an XML file (Bookstore.xml) as follows:
<?xml version= "1.0" encoding= "gb2312"?>
<bookstore>
<book genre= "Fantasy" isbn= "2-3631-4" >
<title>oberon ' s legacy</title>
<author>corets, eva</author>
<price>5.95</price>
</book>
</bookstore>

1. Insert a <book> node into the <bookstore> node:
XmlDocument xmldoc=new XmlDocument ();
Xmldoc.load ("Bookstore.xml");
XmlNode Root=xmldoc.selectsinglenode ("bookstore");//Find <bookstore>
XmlElement xe1=xmldoc.createelement ("book");//Create a <book> node
Xe1. SetAttribute ("Genre", "Li Zhanhong");/set the node genre property
Xe1. SetAttribute ("ISBN", "2-3631-4");//Set the node ISBN property

XmlElement xesub1=xmldoc.createelement ("title");
Xesub1. Innertext= "CS from getting started to proficient";/Set Text node
Xe1. AppendChild (XESUB1);//Add to <book> node
XmlElement xesub2=xmldoc.createelement ("author");
Xesub2. innertext= "Hou Jie";
Xe1. AppendChild (XESUB2);
XmlElement xesub3=xmldoc.createelement ("price");
Xesub3. innertext= "58.3";
Xe1. AppendChild (XESUB3);

Root. AppendChild (XE1);//Add to <bookstore> node
Xmldoc.save ("Bookstore.xml");
//===============================================
The results are:
<?xml version= "1.0" encoding= "gb2312"?>
<bookstore>
<book genre= "Fantasy" isbn= "2-3631-4" >
<title>oberon ' s legacy</title>
<author>corets, eva</author>
<price>5.95</price>
</book>
<book genre= "Li Zhanhong" isbn= "2-3631-4" >
<title>cs from getting started to mastering </title>
<author> Hou Jie </author>
<price>58.3</price>
</book>
</bookstore>

2, modify the node: The genre property value of "Li Zhanhong" node genre value changed to "Update Li Zhanhong", the node's child node <author> text modified to "Asia wins."
XmlNodeList Nodelist=xmldoc.selectsinglenode ("bookstore"). childnodes;//gets all the child nodes of the bookstore node
foreach (XmlNode xn in nodelist)//traverse all child nodes
{
XmlElement xe= (XmlElement) xn;//Converts a child node type to a XmlElement type
if (XE. GetAttribute ("genre") = = "Li Zhanhong")//If genre property value is "Li Zhanhong"
{
Xe. SetAttribute ("Genre", "Update Li Zhanhong");//Modify this property to "Update Li Zhanhong"

XmlNodeList Nls=xe. CHILDNODES;//continues to fetch all child nodes of the XE child node
foreach (XmlNode xn1 in NLS)//traversal
{
XmlElement xe2= (XmlElement) xn1;//conversion type
if (Xe2. name== "Author")//If found
{
Xe2. innertext= "Asia wins";//Modify
break;//find out and get out of here.
}
}
Break
}
}

Xmldoc.save ("Bookstore.xml"),//save.
//==================================================
The final results are:
<?xml version= "1.0" encoding= "gb2312"?>
<bookstore>
<book genre= "Fantasy" isbn= "2-3631-4" >
<title>oberon ' s legacy</title>
<author>corets, eva</author>
<price>5.95</price>
</book>
<book genre= "Update Li Zhanhong" isbn= "2-3631-4" >
<title>cs from getting started to mastering </title>
<author> Asia wins </author>
<price>58.3</price>
</book>
</bookstore>

3, delete <book genre= "Fantasy" isbn= "2-3631-4" > Node genre properties, delete <book genre= "update Li Zhanhong" isbn= "2-3631-4" > node.
XmlNodeList Xnl=xmldoc.selectsinglenode ("bookstore"). ChildNodes;

foreach (XmlNode xn in xnl)
{
XmlElement xe= (XmlElement) xn;
if (XE. GetAttribute ("genre") = = "Fantasy")
{
Xe. RemoveAttribute ("genre");//Delete genre property
}
else if (XE. GetAttribute ("genre") = = "Update Li Zhanhong")
{
Xe. RemoveAll ()//delete all contents of the node
}
}
Xmldoc.save ("Bookstore.xml");
//===========================================
The final results are:
<?xml version= "1.0" encoding= "gb2312"?>
<bookstore>
<book isbn= "2-3631-4" >
<title>oberon ' s legacy</title>
<author>corets, eva</author>
<price>5.95</price>
</book>
<book>
</book>
</bookstore>

4, display all the data.
XmlNode Xn=xmldoc.selectsinglenode ("bookstore");

XmlNodeList Xnl=xn. ChildNodes;

foreach (XmlNode xnf in XNL)
{
XmlElement xe= (XmlElement) xnf;
Console.WriteLine (XE. GetAttribute ("genre"))//Display property value
Console.WriteLine (XE. GetAttribute ("ISBN"));

XmlNodeList Xnf1=xe. ChildNodes;
foreach (XmlNode xn2 in Xnf1)
{
Console.WriteLine (xn2. innertext);//Display child node point text
}
}