internal void QueuePoolForRelease(System.Data.ProviderBase.DbConnectionPool pool, bool clearing)
 {
     pool.Shutdown();
     lock (this._poolsToRelease)
     {
         if (clearing)
         {
             pool.Clear();
         }
         this._poolsToRelease.Add(pool);
     }
     this.PerformanceCounters.NumberOfInactiveConnectionPools.Increment();
 }