数据缓存更改通知

Question

因为业务需要 有多个表缓存在一个dataset中代码如下        public DataSet ExecuteCacheData()
        {
            DataTable dt = this.ExecuteDataTable();
            if (HttpRuntime.Cache["ds"] == null)
            {
                //开启更改通知
                SqlCacheDependencyAdmin.EnableNotifications(this._ConnectionString);
                //连接到 SQL Server 数据库并为 SqlCacheDependency 更改通知准备数据库表
                SqlCacheDependencyAdmin.EnableTableForNotifications(_ConnectionString, dt.TableName);
                //定制缓存策略
                SqlConnectionStringBuilder ConnectionStringBuilder = new SqlConnectionStringBuilder(this._ConnectionString);
                SqlCacheDependency CacheDependency = new SqlCacheDependency(ConnectionStringBuilder.InitialCatalog, dt.TableName);
                DataSet ds = new DataSet();
                ds.Tables.Add(dt.Copy());
                HttpRuntime.Cache.Add("ds", ds, CacheDependency, Cache.NoAbsoluteExpiration, new TimeSpan(1, 0, 0), CacheItemPriority.High, new CacheItemRemovedCallback(this.RemovedCallback));
            }
            else
            {
                DataSet ds = (DataSet)HttpRuntime.Cache["ds"];
                ds.Tables.Add(dt.Copy());
            }
            return (DataSet)HttpRuntime.Cache["ds"];
        }修改数据库中的us_Hols表会触发下面的事件：就是从缓存中的Dataset中移除us_Hols表        public void RemovedCallback(String k, Object v, CacheItemRemovedReason r)
        {
            if (r == CacheItemRemovedReason.DependencyChanged)
            {
                DataSet ds = (v as DataSet);
                ds.Tables.Remove("us_Hols");
                HttpRuntime.Cache[k] = ds;
            }
        }问题是怎么得到us_Hols表的表名称啊
要实现，更改数据库中的aa表从本地缓存的Dataset中移除aa,更改数据库中的bb表从本地缓存的Dataset中移除bb...