C.D.I. problem... anyone.. plz help me..

how much will it cost for a c.d.i. box?? has anyone of you guys have a same problem with me before?? i tried to start my bike but its some kind like the feul didn't fill the carburator..
it sounds empty... i sent to a local workshop and the mechanic said that my C.D.I box ( coil ) didn't work.
it sounds empty... i sent to a local workshop and the mechanic said that my C.D.I box ( coil ) didn't work.