ASP.NET对XML常用操作代码 (6)

    XmlElement xesub1=xmlDoc.CreateElement("username"); //创建第一个节点的第一个元素里的属性
    xesub1.InnerText=str_username;//设置文本节点
    xe1.AppendChild(xesub1);//将指定节点添加到该节点的子节点列表的末尾
    XmlElement xesub2=xmlDoc.CreateElement("password");
    xesub2.InnerText=str_password;
    xe1.AppendChild(xesub2);
    XmlElement xesub3=xmlDoc.CreateElement("study");
    xesub3.InnerText=str_study;
    xe1.AppendChild(xesub3);

    root.AppendChild(xe1);
    xmlDoc.Save (url);//保存XML文件

    ReadXML();
   }
   catch (Exception ex)
   {
    Response.Write(ex.ToString());
   }

  }
  #endregion

  #region 编辑取消

  private void DataGrid1_EditCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   this.DataGrid1.EditItemIndex = e.Item.ItemIndex;
   ReadXML();
  }

  private void DataGrid1_CancelCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   this.DataGrid1.EditItemIndex = -1;
   ReadXML();
  }
  #endregion

  #region 修改XML数据

  private void DataGrid1_UpdateCommand(object source, System.Web.UI.WebControls.DataGridCommandEventArgs e)
  {
   string url = Server.MapPath("user.xml");

   string str_username=DataGrid1.DataKeys[e.Item.ItemIndex].ToString();

   TextBox txt_username = (TextBox)e.Item.FindControl("Textbox3");
   TextBox txt_password = (TextBox)e.Item.FindControl("Textbox4");
   DropDownList drp_study=(DropDownList)e.Item.FindControl("DropDownList2");

   XmlDocument xmlDoc=new XmlDocument();