System.Net.Security.SslStreamInternal.EndRead C# (CSharp) Method

        internal int EndRead(IAsyncResult asyncResult)
        {
            if (asyncResult == null)
            {
                throw new ArgumentNullException(nameof(asyncResult));
            }

            BufferAsyncResult bufferResult = asyncResult as BufferAsyncResult;
            if (bufferResult == null)
            {
                throw new ArgumentException(SR.Format(SR.net_io_async_result, asyncResult.GetType().FullName), nameof(asyncResult));
            }

            if (Interlocked.Exchange(ref _nestedRead, 0) == 0)
            {
                throw new InvalidOperationException(SR.Format(SR.net_io_invalidendcall, "EndRead"));
            }

            // No "artificial" timeouts implemented so far, InnerStream controls timeout.
            bufferResult.InternalWaitForCompletion();

            if (bufferResult.Result is Exception)
            {
                if (bufferResult.Result is IOException)
                {
                    throw (Exception)bufferResult.Result;
                }

                throw new IOException(SR.net_io_read, (Exception)bufferResult.Result);
            }

            return bufferResult.Int32Result;
        }