System.IO.BufferedStream.EnsureBufferAllocated C# (CSharp) Method

        private void EnsureBufferAllocated()
        {
            Debug.Assert(_bufferSize > 0);

            // BufferedStream is not intended for multi-threaded use, so no worries about the get/set race on _buffer.
            if (_buffer == null)
                _buffer = new byte[_bufferSize];
        }