how to set date as client requirment

hi

i m using window form and one datetimepicker and i m set custom formate in datetimepicker as dd/MM/yyyy now is sql save formate and i use on my report but
client want to date like 11-Dec-09
but mu date is 11/12/2009
how to convert in windwo form
or sql

is any idea in sql to convert date like 11-dec-09

if not
then in window programming

please help me