best way to store data in wpf application -

i want know best way store sensitive , secured data in wpf application not appear inside exe file databases , store data , retrieve when program start again

going latest comment, seems need encrypt user input data. depending on size of data go sql server 2008 r2 express or sql server compact. can have @ sql server 2008 r2 ce encryption or sql server 2008 r2 express encryption.

if not looking @ databases, have @ file based encryption using system.security.cryptography namespace.

higher levels of security available in enterprise version of sql server. more information on encryption levels in sql server 2008 can found here.

note encryption of database (depending on algorithm used) can negatively affect performance.