public ThreadPoolExecutionHandler(int concurrentRequests)
 {
     lock (_lock)
     {
         if (_throttler == null)
             _throttler = new ThreadPoolThrottler<IAsyncExecutionContext>(concurrentRequests);
     }
 }
 public ThreadPoolExecutionHandler(int concurrentRequests)
 {
     lock (_lock)
     {
         if (_throttler == null)
         {
             _throttler = new ThreadPoolThrottler <IAsyncExecutionContext>(concurrentRequests);
         }
     }
 }