1 创建xml文档

//保存所有xml文件的数据
XmlDocument doc = new XmlDocument();

//加载<?xml version="1.0"?> 头部
XmlNode xmlNode = doc.CreateNode(XmlNodeType.XmlDeclaration, "","");
doc.AppendChild(xmlNode);

//创建根目录
XmlElement el= doc.CreateElement("PhoneBook");
doc.AppendChild(el);

//读取创建好的根目录
XmlElement root = doc.DocumentElement;

//在根目录一下建节点
el = doc.CreateElement("name");
el.InnerText = "加菲";
root.AppendChild(el);

//在根目录一下建节点
el = doc.CreateElement("city");
el.InnerText = "纽约";
root.AppendChild(el);

doc.Save(this.MapPath("XML1.xml"));

二：读取xml文件

XmlTextReader xtr = new XmlTextReader(this.MapPath(@"XML\student.xml"));

this.TextBox1.Text = "";
while (xtr.Read())
{
//if (xtr.NodeType == XmlNodeType.Element)
//{
string s= xtr.ReadString().Trim();
if(s!="")
this.TextBox1.Text += s+"\n";

//}
}
xtr.Close();