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XmlDocument doc = Cache["user"] as XmlDocument;
        if (doc == null)
        {
            doc = new XmlDocument();
            string filePath = Server.MapPath("user.xml");
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            CacheDependency c = new CacheDependency(filePath);
            doc.Load(filePath);
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            Cache.Insert("skin", doc, c
            ,Cache.NoAbsoluteExpiration
            ,TimeSpan.fromMinutes(30)
            );
        }
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<configuration>
<appSettings/>
  <connectionStrings>
    <add name="connStr" connectionString="server=192.168.1.24;uid=sa;pwd=l23;database=CacheTest;"/>
  </connectionStrings>
<system.web>
    <caching>
      <sqlCacheDependency>
        <databases>
          <!--½ÚµãconnectionStringNamµÄÖµconnStr±ØÐëÓëÉÏÃæ¶¨ÒåµÄÁ¬½Ó´®½ÚµãnameµÄÖµÏàͬ-->
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