Subscribe to comments of blogs: Subscribe an email address to comments
After you create and Subscribe to comments of blogs: Register the new comment notifications strategy, you need to obtain the subscriber’s email address by using a form submit or a custom web service.
Obtain the thread key of the comments, using the blog post ID. Use the following sample:
Next, subscribe to the respective thread type by using the Subscribe method of the comment service that calls a method with the same signature from the currently registered ICommentNotificationsStrategy. To subscribe, copy the following code in the Bootstrapper.Bootstrapped Sitefinity event that you can use in the Global.asax file or, depending on your needs, in any widget, service, and so forth: