这个源码是我根据网上一个vb.net编辑xml文件的原理用c#重写的。除重用xml文件外.
并未重用任何代码！.

这小段代码，可对xml文件的记录进行删除，修改，或增加新记录。
利用了datagrid控件的sortcommand事件对xml里的记录进行排序。

email:ouyang76.263.net
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<%@page language="c#" Trace="true"%>
<%@import namespace="System.Data"%>
<%@import namespace="System.IO"%>
<script language="c#" runat="server">
string xmlfile="books2.xml",xpath;
void page_load(Object obj,EventArgs e)
{
xpath=Server.MapPath(xmlfile);
  if(!Page.IsPostBack)
   {
      Dataload("isbn");
      }
  }
 
  void Dataload(string psort)
  {
    DataSet ds=new DataSet();
    FileStream fs=new FileStream(xpath,FileMode.Open);
    ds.ReadXml(fs);
  
   if(ds.Tables.Count==0)
      {
        Response.Write("xml文件内无记录!!!!");
        fs.Close();
        Response.End();
        }
    Trace.Warn("表记录数",Convert.ToString(ds.Tables[0].Rows.Count));
   
    DataRow dr=ds.Tables[0].NewRow();//新建一行
    dr["ISBN"] = " Add ISBN";
    ds.Tables[0].Rows.InsertAt(dr,0);//插入到第0行位置
  
    Trace.Warn("表数目",Convert.ToString(ds.Tables.Count));//以红字显示调试信息
   
    //grid1.DataSource=ds.Tables[0].DefaultView;
    //grid1.DataBind();
   
    DataView dv=new DataView(ds.Tables[0]);
    Trace.Warn("字串长度:"+psort,Convert.ToString(psort.Length));//排序字符串的长度
    if(psort.Length>0)
         dv.Sort=psort;
       
    grid1.DataSource=dv;
    grid1.DataBind();
    fs.Close();
  }
 
  void grid_sort(Object obj,DataGridSortCommandEventArgs e)
  {
   if(grid1.EditItemIndex==-1)
     Dataload(e.SortExpression);
    else
     Response.Write("正在编辑暂不能排序!!");
  }
 
  void grid_edit(Object obj,DataGridCommandEventArgs e)
  {
  grid1.EditItemIndex=(int)e.Item.ItemIndex;
  show_del("hide");
  Dataload("");
  }
 
  void grid_cancel(Object obj,DataGridCommandEventArgs e)
  {
  grid1.EditItemIndex=-1;
  show_del("show");
  Dataload("");
  }
 
  void grid_update(Object obj,DataGridCommandEventArgs e)
  {
  int numcell=e.Item.Cells.Count;//单元格数目(e.Item是当前发生事件的表格行)
  int currentrow=e.Item.DataSetIndex;
  //int curr2=e.Item.ItemIndex;//与上句等价,可以不带(int)
  Trace.Warn("当前更新行号 = ",Convert.ToString(currentrow));
  //Trace.Warn("2当前更新行号 = ",Convert.ToString(curr2));
 
    DataSet ds=new DataSet();
    ds.ReadXml(xpath);//将xml模式和数据读取到dataSet;
    DataRow dr;//表示DataTable中的一行信息.
 
     if(currentrow==0)
       dr=ds.Tables[0].NewRow();
     else
       dr=ds.Tables[0].Rows[e.Item.DataSetIndex - 1];
   
    string[] str={"isbn", "author", "title", "category", "comments"};
    int j=-1;
    for(int i=2;i<numcell;i++)//跳过1和2column
     {
        j=j+1;
        string ctext;
        ctext=((TextBox)e.Item.Cells[i].Controls[0]).Text;
       
        dr[str[j]] = ctext;
        Trace.Warn(Convert.ToString(i)+str[j]+":每一行的文本",ctext);
       }
      
    if(currentrow==0)
    {
      Response.Write("加入新记录!!");
      ds.Tables[0].Rows.InsertAt(dr,0);
      }
     
    ds.WriteXml(xpath);//将表示dataset的xml写入到xml文件中,包括数据和模式.
    grid1.EditItemIndex = -1;//无此句仍在编辑界面
    show_del("show");
    Dataload("");
  }
 
  void show_del(string state)
  {
  string tmp=state;
  switch(tmp)
  {
   case "show":
   grid1.Columns[0].Visible = true;
     break;
   case "hide":
    grid1.Columns[0].Visible = false;
     break;
     default:
   grid1.Columns[0].Visible = true;
     break;//也要带break
    }
  }

  void initialize(Object obj,DataGridItemEventArgs e)//注意参数与其它函数不同
  {
     //e.Item.Cells[0].Text="aaaaa";//
     if(e.Item.ItemIndex==0)//如果是第一行
     {
     LinkButton a0=new LinkButton();
     a0=(LinkButton)e.Item.Cells[0].Controls[0];
    
     LinkButton a1=new LinkButton();
     a1=(LinkButton)e.Item.Cells[1].Controls[0];//在grid内建一个linkbutton控件
    
    if(a0.Text=="删 除")
        a0.Text="";
    if(a1.Text=="编 辑")
         a1.Text="[AddNew]";
      }
   }
  
  void grid_del(Object obj,DataGridCommandEventArgs e)
  {
  Response.Write("XX");
  Trace.Warn("正要删除",Convert.ToString(e.Item.ItemIndex));//控件中的行数
  int curr=e.Item.ItemIndex;
    DataSet ds=new DataSet();
    ds.ReadXml(xpath);
   
    DataRow dr=ds.Tables[0].Rows[curr-1];//有一行是新加的。
    dr.Delete();//找到相应的数据行，将其删除
    ds.WriteXml(xpath);
 
  grid1.EditItemIndex = -1;
  Dataload("");

  }
</script>

<form runat="server">
<asp:datagrid id="grid1" runat="server"
alternatingitemstyle-backcolor="#eeeeee"
headerstyle-backcolor="lightyellow"
font-size="10pt"
allowsorting="true"
onsortcommand="grid_sort"
oneditcommand="grid_edit"
oncancelcommand="grid_cancel"
onupdatecommand="grid_update"
onitemcreated="initialize"   
ondeletecommand="grid_del"
bordercolor="#999999"
>
<columns>
<asp:buttoncolumn text="删 除" commandname="delete"/>
<asp:editcommandcolumn buttontype="linkbutton" updatetext="更 新" canceltext="取 消" edittext="编 辑" headertext=""/>
</columns>
</asp:datagrid>
</form>
--------------------------------------------------------------------
xml文件(文件名:books2.xml)

<?xml version="1.0" standalone="yes"?>
<books>
  <book>
    <isbn>2e2e2we2we2</isbn>
    <author>fefdw</author>
    <title>2e2eef</title>
    <category>324tg</category>
    <comments>r3rrgeqw21</comments>
  </book>
  <book>
    <isbn>1234345</isbn>
    <author>ssdfdfe</author>
    <title>fgregre</title>
    <category>r4er43trt</category>
    <comments>r3r3redqeq</comments>
  </book>
  <book>
    <isbn>1234345</isbn>
    <author>ssdfdfe</author>
    <title>fgregre</title>
    <category>r4er43trt</category>
    <comments>r3r3redqeq</comments>
  </book>
  <book>
    <isbn>0679757651</isbn>
    <author>Tom Peters</author>
    <title>Circle of Innovation</title>
    <category>marketing</category>
    <comments>His most recent book is his best by far!</comments>
  </book>
  <book>
    <isbn>0884270610</isbn>
    <author>Eli Goldthrait</author>
    <title>The Goal</title>
    <category>management</category>
    <comments>Advocate of Theory of Constraints as applied to managment and optimization.</comments>
  </book>
  <book>
    <isbn>068485600X</isbn>
    <author>Jeff Cox, Howard Stevens</author>
    <title>Selling the Wheel</title>
    <category>management</category>
    <comments>Excellent Treatise/Novel on the entire Sales Cycle</comments>
  </book>
  <book>
    <isbn>0672316498</isbn>
    <author>Alan Cooper</author>
    <title>The Inmates Are Running The Asylum</title>
    <category>management</category>
    <comments>The father of Visual Basic and creator of the new art of Interaction Design - very valuable in designing websites. Basically the worlds most cutting edge thinker in User Interface design aimed at simplifying software use.</comments>
  </book>
</books>