private static void ReadFrameCallback(AsyncProtocolRequest asyncRequest) { try { SslStreamInternal sslStream = (SslStreamInternal)asyncRequest.AsyncObject; BufferAsyncResult bufferResult = (BufferAsyncResult)asyncRequest.UserAsyncResult; if (-1 == sslStream.ProcessFrameBody(asyncRequest.Result, bufferResult.Buffer, bufferResult.Offset, bufferResult.Count, asyncRequest)) { // in case we decrypted 0 bytes start another reading. sslStream.StartReading(bufferResult.Buffer, bufferResult.Offset, bufferResult.Count, asyncRequest); } } catch (Exception e) { if (asyncRequest.IsUserCompleted) { // This will throw on a worker thread. throw; } asyncRequest.CompleteUserWithError(e); } }