Login form & Registration form in windows phone application

Hi sir,

 

I am working with login form with local database(sqlite) in C#. I cannot retrieve the username & password from the inserted values/registered values. 

If the user closes the app with out selecting logout, in the next app launch the same page should be displayed. If he selects logout before closing the app while he opens the app it should display login page(with the help of Applicationdata, local settings)