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The NotifyUser method is a customized method, which always is called to Update UI to Show notification message. This method is called from within the individual scenario XAML pages on the instance of MainPage that's returned from the static Current field. NotifyUser takes a parameter of type NotifyType.
You could find the source code of NotifyUser method here. Besides, you could also click the method name, then you will find many similar method definitions, please check these methods.
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