I want to send an email with some content as a body in my metro app :-
1)since system.net.mail is not supported in metro application i have decided to use this :-
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The email story in WinStore apps is pretty broken right now. You can either use mailto: with no content or use share charms with no email details. I suspect they must enable support for some email document contracts at some point in the future, but I don't think it is available yet.
*EDIT
It also sounds like a great opportunity for someone to write a web service to send emails if a good one doesn't already exist. You could of course write one yourself.