Facebook.CombinationStream.EndRead C# (CSharp) Method

        public override int EndRead(IAsyncResult asyncResult)
        {
            // todo: check if it is of same reference
            asyncResult.AsyncWaitHandle.WaitOne();
            var ar = (CombinationStreamAsyncResult)asyncResult;
            if (ar.Exception != null)
            {
                throw ar.Exception;
            }

            return ar.BytesRead;
        }