System.Net.Sockets.NetworkStream.UnsafeBeginWrite C# (CSharp) Method

        internal virtual IAsyncResult UnsafeBeginWrite(byte[] buffer, int offset, int size, AsyncCallback callback, Object state)
        {
#if DEBUG
            using (DebugThreadTracking.SetThreadKind(ThreadKinds.User | ThreadKinds.Async))
            {
#endif
                bool canWrite = CanWrite; // Prevent race with Dispose.
                if (_cleanedUp)
                {
                    throw new ObjectDisposedException(this.GetType().FullName);
                }

                if (!canWrite)
                {
                    throw new InvalidOperationException(SR.net_readonlystream);
                }

                Socket chkStreamSocket = _streamSocket;
                if (chkStreamSocket == null)
                {
                    throw new IOException(SR.Format(SR.net_io_writefailure, SR.net_io_connectionclosed));
                }

                try
                {
                    // Call BeginSend on the Socket.
                    IAsyncResult asyncResult =
                        chkStreamSocket.UnsafeBeginSend(
                            buffer,
                            offset,
                            size,
                            SocketFlags.None,
                            callback,
                            state);

                    return asyncResult;
                }
                catch (Exception exception)
                {
                    if (exception is OutOfMemoryException)
                    {
                        throw;
                    }

                    // Some sort of error occurred on the socket call,
                    // set the SocketException as InnerException and throw.
                    throw new IOException(SR.Format(SR.net_io_writefailure, exception.Message), exception);
                }
#if DEBUG
            }
#endif
        }