如何增加xml的Node

Question

    小弟跪求答案
                       orz.....
         Orz..........
                                  orZ...........
          OrZ........
                                                     ☺rz
                      ¤rZ
                                       ●rz
╭︿︿︿╮ 
{/ o  o /}  
 ( (oo) )   
  ︶ ︶︶
╭︿︿︿╮
{/-◎◎-/}
 ( (oo) ) 
  ︶︶︶ 
 ╭︿︿︿╮ 
 {/ .  . /}
  ( (oo) )    
  ︶ ︶ ︶ 
╭︿︿︿╮ 
{/-★★-/} 
 ( (oo) )
  ︶︶︶ 
╭︿︿︿╮
{/-●●-/}
 ( (oo) )
  ︶︶︶ 
╭︿︿︿╮
{/ -  - /} 
 ( (..) ) 
  ︶︶︶  
╭︿︿︿╮
{/ ·· /}
 ( (00）) 
  ︶︶︶ 
╭⌒╮打雷啦━┅~ ¤　 ╭⌒╮ ╭⌒╮ 
╭⌒╭⌒╮╭⌒╮～╭⌒╮︶︶,　︶︶
,︶︶︶︶,""︶~~ ,""~︶︶　 ,""
    *                     . :
          \     |   /
    .          ____            .
        ---   /    \   ---     .
     .       | ~  ~ |        .
        ---   \__O_/   --- 
   ...         /       \   
                 |::.--.-.::
:( (    ):::::  东边日出西边雨 
(_,  \ ) ,_)::  道是无晴却有情       |
:::-'--`--:::::::: ~~|     ,       \ _ /
::::::::::::::::::: ,|`-._/|   -==  (_)  ==-
::::::::^^::::::::.' |   /||\      /   \
::::::^^::::::::.'   | ./ ||`\       |
:::::::::::::::/ `-. |/._ ||  \
::::::::::::::|      ||   ||   \
 ~~=~_~^~ =~ \~~~~~~~'~~~~'~~~~/~~`` ~=~^~
~^^~~-=~^~ ^ `--------------'~^~=~^~_~^=~^~

Answer 1

算了。不求了。我知道答案了增加试出来了    (～ o ～)~zZ
                           O(∩_∩)O哈哈~
                   ;-)。。
  高兴。
              
            答案。
            XmlDocument xmlDocument = new XmlDocument();            xmlDocument.Load("students.xml");            XmlNode root = xmlDocument.SelectSingleNode("Students/AllStudent");            XmlElement xmlElement = xmlDocument.CreateElement("Student");            xmlElement.SetAttribute("studentid", "21");            XmlElement xmlElement2 = xmlDocument.CreateElement("studentname");            xmlElement2.InnerText = "Edson Chen";            xmlElement.AppendChild(xmlElement2);            root.AppendChild(xmlElement);            xmlDocument.Save("students.xml");