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using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Xml;
namespace WebApplication2
{
    /// <summary>
    /// XMLHelper XMLÎĵµ²Ù×÷¹ÜÀíÆ÷
    /// </summary>
    public class XMLHelper
    {
        public XMLHelper()
        {
            //
            // TODO: ÔÚ´Ë´¦Ìí¼Ó¹¹Ô캯ÊýÂß¼­
            //
        }
        #region XMLÎĵµ½Úµã²éѯºÍ¶ÁÈ¡
        /// <summary>
        /// Ñ¡ÔñÆ¥ÅäXPath±í´ïʽµÄµÚÒ»¸ö½ÚµãXmlNode.
        /// </summary>
        /// <param name="xmlFileName">XMLÎĵµÍêÈ«ÎļþÃû(°üº¬ÎïÀí·¾¶)</param>
        /// <param name="xpath">ҪƥÅäµÄXPath±í´ïʽ(ÀýÈç:"//½ÚµãÃû//×Ó½ÚµãÃû")</param>
        /// <returns>·µ»ØXmlNode</returns>
        public static XmlNode GetXmlNodeByXpath(string xmlFileName, string xpath)
        {
            XmlDocument xmlDoc = new XmlDocument();
            try


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ºÎνLINQ? LINQ¼´.NET ÓïÑÔ¼¯³É²éѯ(.NET Language-Integrated Query (LINQ) Framework),Ϊ.NET¼Ü¹¹ÖеÄÖØÒª×é³É²¿·Ö¡£LINQϵÁм¼ÊõÌṩÁËÕë¶Ô¶ÔÏó(LINQ)¡¢¹ØϵÊý¾Ý¿â(LINQ to SQL)ºÍXML(LINQ to XML)µÄÒ»ÖÂÐÔ²éѯÌåÑé¡£ ʲôÊÇLINQ to XML? LINQ to XML ʹÓÃ×îеÄ.NET FrameworkÓïÑÔ¹¦ÄÜ£¬Ï൱ÓÚ¸üкÍÖØÐÂÉè¼ÆµÄÎĵµ¶ ......

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using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
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private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
             this.comboBox2.Items.Clear();
            switch(this.comboBox1.SelectedIndex)
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  <?xml   version="1.0"   encoding="gb2312"?>  
  <bookstore>  
      <book   genre="fantasy"   ISBN="2-3631-4">  
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