When using System.IO.FileStream, I write 8 bytes, then seek to the start of the file, does the 8 bytes get flushed on seek and the buffer become a readbuffer at that point instead of being a write buffer?

[DR]

When using System.IO.FileS tream, I write 8 bytes, then seek to the start of
the file, does the 8 bytes get flushed on seek and the buffer become a
readbuffer at that point instead of being a write buffer?