Book Club Points (C#)

Serendipity Booksellers has a book club that awards points to its customers based on the number of books purchased each month. The points are awarded as follows:

If a customer purchases 0 books, he or she earns 0 points. If a customer purchases 1 book, he or she earns 5 points. If a customer purchases 2 books, he or she earns 15 points. If a customer purchases 3 books, he or she earns 30 points. If a customer purchases 4 or more books, he or she earns 60 points.

Create an application that lets the user enter the number of books that he or she has purchased this month and displays the number of points awarded using a label and not MessageBox. (Must be used in C#)