In the following article I will show how to pop up a message dialog in Universal Windows Platform.
MessageDialog class represents a dialog. The dialog has a command bar that can support up to three commands. If you don't specify any commands, then a default command is added to close the dialog.
The dialog dims the screen behind it and blocks touch events from passing to the app's canvas until the user responds.
Message dialog should be used sparingly, and only for critical messages or simple questions that must block the user's flow.
Step 4: Run your application and test yourself.
Microsoft's Windows AppStudio