XML的创建和修改，首先是创建一个XML，然后修改刚刚创建的XML；代码如下：XmlDataDocument doc = new XmlDataDocument();
XmlDeclaration dec = doc.CreateXmlDeclaration("1.0", "GB2312", null);
doc.AppendChild(dec);
//一级时间
XmlNode Times = doc.CreateElement("Times");
doc.AppendChild(Times);
//二级提示时间
XmlElement Time = doc.CreateElement("Time");
//二级
XmlElement Id = doc.CreateElement("Id");..........
