[MonoTouch] feature detection

[dermotos]

What feature are you looking for? Generally you test for each feature prior
to attempting to use it. For example, the MFMailComposeViewController
(Monotouch.MessageUI) has a CanSendMail boolean property, which you should
check to ensure the current device can send email, before attempting to use
it.
Same goes for the camera, gyroscope etc etc etc... 
You shouldnt base your code on the type of device they user has. The main
two issues with this would be that Apple will come out with new devices in
the future, and your code wont know what features they have, and secondly,
just because a user has a particular device, doesnt mean they can do what
you want. (for example, MFMailComposeViewController.CanSendMail will return
false if a user hasnt setup mail on their device, even if they are on a
device that supports emailing).

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