I'm trying to put a xml file in the Cache to be shared for the whole
application. Whenever I change the xml file I need to refresh the Cache,
so I put this code on the global.asax.cs file. It add a callback to
reload the xml file, but it seems that the callback doesn't work. ¿What
I'm doing wrong?

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private static Cache _cache = null;
private static string _path = null;
protected void Application_Start(Object sender, EventArgs e) {
   _cache = this.Context.Cache;
   _path = Server.MapPath("xml/traduccion.xml");               
   LoadXML();
}
private void LoadXML() {           
   XmlDocument xmlDoc = new XmlDocument();
   xmlDoc.Load(_path);
   _cache.Insert("xmlDoc", xmlDoc,
   new CacheDependency(_path),
   Cache.NoAbsoluteExpiration,
   Cache.NoSlidingExpiration,
   CacheItemPriority.Default,
   new CacheItemRemovedCallback(reload_Callback));
}
private void reload_Callback(string key, Object item,
                                         CacheItemRemovedReason reason){
   LoadXML();
}