Flushing the stream will not flush its underlying encoder unless you explicitly call Flush or Stream.Close.

If you use the BufferedStream.#ctor(Stream, int) constructor, thus specifying the buffer size while creating the BufferedStream object, the content is flushed when it reaches the buffer size. For example, code such as BufferedStream bs = new BufferedStream(bs, 5) will flush the content when the buffer size reaches 5 bytes.

All the read and write methods of BufferedStream automatically maintain the buffer, so there is no need to invoke Flush when switching back and forth between reading and writing.

Namespace: System.IO
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0