Windows Phone 7 and ASP.Net

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Mobile

Windows-Phone-7

Hi
I am creating an application that i need to access through PC and mobile. I decided to create the application in windows phone 7 but there are 2 problems.


1. where the DB will reside in the application, should I must use WCF services?
2. How do I manage user/ role authorization like asp.net has aspnetmdf file?


please help.


Note: The DB will comprise of around 7 tables and 5000 records atleast.