Membership API WP7

I have a question that I have researched a lot but cannot find any solid proven answers for yet.

I have a Web Application that I am developing, potentially using Membership API for user membership and authentication. This works great when people login from their browsers. This has been tried and tested and it just works great.

I want to extend the same 'Registration/Login' functionality from my WP7 (Windows Phone). Now my questions are: 1. What is the best approach to do the same? 2. Can I use WCF to do the same? I know I could use the Cookie Container approach, but this will cause issues on removal of cookies etc right?

I want the WP7 app work such that once the user logs in, he remains logged in.

1. Will I have to write my own OAuth2 provider? If yes, can someone please provide me with any good links that give me examples.

Ev开发者_StackOverflowen better, have people developed their own WP7 applications that use User Registration and Authentication? Any insights would help.

I understand that Azure now has Access Control that allows me to link in with Hotmail, Facebook etc to validate a user. In this scenario, how can I ensure that I still link this authentication with an Internal User identifier?

I am a little confused with the plethora of options and not a single popular blog explains this clearly (NOT that I have come across, yet!)

I would highly appreciate insights.

Regards, Anup

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there is a walkthrough for connecting with ACS & windows Phone 7 (including source files) on msdn:

http://msdn.microsoft.com/en-us/gg192968

hope this helps