使用wpf（离线）应用程序更新问题c＃

Hi i have created weeks ago a WPF( visual studio 2010) application which runs offline localy on my pc.I is connected to a database(MS SQL .mdf) ofcourse and it works well. but now i need to make an update of the application and i wonder how to do it the main issue for me is how not to start with the empty database again how to make the update and use the already filled database? Any referals to where i can read something or some examples. THX EDIT: if its possible i want to do the update not using internet. The database structure is the same one i just made some changes to the code behind...Hi i have created weeks ago a WPF( visual studi