System.IO.FileStream.WriteByteCore C# (CSharp) Method

        private void WriteByteCore(byte value)
        {
            PrepareForWriting();

            // Flush the write buffer if it's full
            if (_writePos == _bufferLength)
                FlushWriteBuffer();

            // We now have space in the buffer. Store the byte.
            GetBuffer()[_writePos++] = value;
        }