创建新xml文件.txt

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			string fileName="booknew.xml";
			XmlTextWriter tw=new XmlTextWriter(fileName,null);
			tw.Formatting=Formatting.Indented;
			tw.WriteStartDocument();
				tw.WriteStartElement("book");
					tw.WriteAttributeString("genre","Mystery");
					tw.WriteAttributeString("ISBN","123456789");
					tw.WriteElementString("title","Case of the Missing Cookie");
					tw.WriteStartElement("author");
						tw.WriteElementString("name","Cookie Monster");
					tw.WriteEndElement();
					tw.WriteElementString("price","9.99");
				tw.WriteEndElement();
			tw.WriteEndDocument();
			tw.Flush();
			tw.Close();
//要点
1.引用
using System.Xml;
2.
WriteStartDocument();要求有WriteEndDocument();呼应
WriteStartElement();要求有WriteEndElement();呼应//多次才能完
tw.WriteElementString();中间有内容