why i can not put my swap files in /dev?

[Tang Jianwei <myhnet@xxxxxxxxx>]

I tried to create some swap files in /dev directory for my desktop.
the dd and mkswap were ok. but when I try to swapon it, i get this:

# swapon /dev/myswap
swapon: /dev/myswap: Invalid argument

but when I mv the file to some other directory like /mnt or /, the 
swapon works.

could sb. tell me why?

-- 
Tang Jianwei

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