protected void OnAverageTransferRateChanged(TransferRateChangedEventArgs e)
 {
     if (AverageTransferRateChanged != null)
     {
         AverageTransferRateChanged(this, e);
     }
 }
 protected void OnCurrentTransferRateChanged(TransferRateChangedEventArgs e)
 {
     if (CurrentTransferRateChanged != null)
     {
         CurrentTransferRateChanged(this, e);
     }
 }