[fw-mvc] help using filters

hi

for example

i have form element textarea called "user_sig"

and user add his/her signature into it ...

but i dont know what filters should i use for this element when updating the DB

also i want to check that the content is no long than for ex 300 character ...

plz help

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Sincerely
Sina Miandashti
MuSicBasE.ir & InvisionPower.ir Admin