如何在c#中使用带有密码的文件作为数据库?

I want to write a program to maintain some important information for me , but i don't want to use sql as database because it is very important for me that no one can access the data , i want to save my data in a file and i want to use a password to protect my file like password in winrar software and then can access the data just in my program, can anyone give me an idea ? Thank u all :) I want to write a program to maintain some impo