Creating my own database for a windows application and database extension should be what i want

Hello,

                I'm Anas Siddiqui. i am creating a windows based application ( project name "inventory system" ) on csharp. i want to create my own database file such as *.wng, *.pwb or any thing that i want to......! i dont want to make my data base on sql or db2 or MS-Access, i want to make my own database file. and after creating database how to attach this file to my application.?

                                       
                                                                                Thank you..!