C# Only, please

Develop a console app that lets the user enter all the grades until the user has entered a negative score. We define that all the students who have passed must earn at least 60 points. While the user is entering each grade, display the number of students who have passed, the number of students who have failed, and the current class average of all the grades entered so far. In addition , if more than 80% of the students have passed, then sidpaly the text "Bonus to the instructor" in the end. Use the Conole's class ReadLine() method and sentinel-controlled iteration to obtain data from the user.