action filter and model binder in mvc

Question

hi

i'm new in mvc

i want to get price in 2 format automatically

i type product.price every where.

if it's for show to user , it convert price to string format with seperate in 3 digit

if it's for calculation or save in database, it convert to float automaticallly

i guess it will be done by actin filter and model binder

but i don't know how

any help please?