I am writing a data structure using 4 or 5 classes. One of these classes has 1 bitmap object as member data. Each of these bitmaps will be about 100kb.

As the months pass the structure will grow to become quite large (maybe 500MB). I'm planning to serialize this data to disc. How does .Net handle such large files? Does it load the whole lot into RAM + virtual mem or does it only pick out parts as needed?

Should I take special measures regarding memory usage?