How do i let the user choose his own password?

I am making a program where the user gets to put his own password in, but i dont no how, do you have to have the new password save to a file everytime. whats the code please, thanks

PanasonicSubz

Please, be more specific.
What kind of file do you want to use?
I've used a table in a access 97 database to store users-id and passwords, but you can use a lot of kind of files.

You can also encrypt the string (password) and then write it to a file or Windows Registry. After user has typed in the password, program checks for valid characters by reading string from that file/registry...
By the way..."no" spelled as "know" (e.g. you don't know...)