Implementing a settings page that incorporates your privacy policy and user consent is the best thing.
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In the code , the only tricky thing to notice is that is equivalent to an HTML ; character (which is a space). Using <Underline> in a TextBlock strips adjacent spaces.
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In the code , we do a few things. First we assume the setting is true if never set. This means the user is opting out. Your code might want to do the reverse. Then, see the EmailComposeTask? This helps the user by pre-composing the email message (if they want to ask a question) and calling Show() lets the Windows Phone OS do the rest – they will get the typical email dialog and are required to push Send.