c# - Login form without database and server -


so developing multi-platform app. want user able login , register either via social medias (facebook api) or email and/or phone number login.

so question is: possible without database , server? using windows 8 os pc visual studio community ide, universal app framework , c# programming language.

also: universal app best option developing multi-platform apps? or example xamarin better choice?

regards,

without database? possible: store login credentials in files (of course creating "database" in case).

without server, quite difficult. mean, should store on client side (which possible if talking mobile application, more difficult if developing website) or, if use third-party api, should download every time information need run app.

anyway if don't want server option able think store credentials on "file" located in client.

regards.


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