这段代码是什么意思？
<%@ Import Namespace="System.Data" %>

<script language="C#" runat="server">
static Cache _cache;
static string _path;

void Application_Start ()
{
_cache = Context.Cache;
_path = Context.Server.MapPath ("Stocks.xml");

DataSet ds = new DataSet ();
ds.ReadXml (_path);

_cache.Insert ("Stocks", ds, new CacheDependency (_path),
Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,
CacheItemPriority.Default,
new CacheItemRemovedCallback (RefreshDataSet));
}

static void RefreshDataSet (String key, Object item,
CacheItemRemovedReason reason)
{
DataSet ds = new DataSet ();
ds.ReadXml (_path);

_cache.Insert ("Stocks", ds, new CacheDependency (_path),
Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,
CacheItemPriority.Default,
new CacheItemRemovedCallback (RefreshDataSet));
}
</script>

谁能够帮我详细解释一下这段代码的工作流程？
越详细越好！

[解决办法]
缓存读写XML
[解决办法]

C# code

  _cache = Context.Cache;      _path = Context.Server.MapPath ("Stocks.xml");  //xml文件路径      DataSet ds = new DataSet ();      ds.ReadXml (_path);   //加xml文件转化到ds中      //插入缓存      //参数意思：     // Cache.Insert 方法 (String, Object, CacheDependency, DateTime, TimeSpan, //CacheItemPriority, CacheItemRemovedCallback)//向 Cache 对象中插入对象，后者具有依赖项、过期和优先级策略以及一个委托（可用于在从 Cache 移除插//入项时通知应用程序）。       _cache.Insert ("Stocks", ds, new CacheDependency (_path),          Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,          CacheItemPriority.Default,          new CacheItemRemovedCallback (RefreshDataSet));
[解决办法]
<%@ Import Namespace="System.Data" %>  

<script language="C#" runat="server">  
 static Cache _cache;  
 static string _path;  

 void Application_Start ()  
 {  
     _cache = Context.Cache; //缓存
     _path = Context.Server.MapPath ("Stocks.xml"); //XML地址

     DataSet ds = new DataSet ();  
     ds.ReadXml (_path); //读取XML

     _cache.Insert ("Stocks", ds, new CacheDependency (_path),  
         Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,  
         CacheItemPriority.Default,  
         new CacheItemRemovedCallback (RefreshDataSet)); //设置缓存依赖项等相关信息
 }  

//回调函数
 static void RefreshDataSet (String key, Object item,  
     CacheItemRemovedReason reason)  
 {  
     DataSet ds = new DataSet ();  
     ds.ReadXml (_path);  

     _cache.Insert ("Stocks", ds, new CacheDependency (_path),  
         Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration,  
         CacheItemPriority.Default,  
         new CacheItemRemovedCallback (RefreshDataSet));  
 }  
</script>  

[解决办法]
楼上回答不错
[解决办法]
用函数RefreshDataSet（）来进行xml的缓存、读写；
[解决办法]
读取XML数据到dataset,添加到缓存
再CacheDependency跟踪缓存依赖项
使用RefreshDataSet 更新缓存 
 
[解决办法]
http://msdn.microsoft.com/zh-cn/library/system.web.caching.cache.insert(VS.80).aspx
[解决办法]
XML依赖缓存    当XML发现变化时自动更新缓存