writing dll's

[csp1]

i am intested in writing some small dll files for programmes for a project i am about to start,
Question: does anyone know of a decompiler or something similar so i could look at the code involved in writing a dll?
Thanks

[AltatemTC]

I don't know why you would need a decompiler unless you are planning to steal someone else's code and decompilers usually don't provide you with anything that would be clear and concise to reap benefit from.

What kind of DLLs are you planning to write and what language?