Beginning C# 7 Hands-On - The Core Language

Running the program

Alright, polymorphism, as you have learned, is an interesting but subtle concept. Open the program in your browser. Start with the top box; put in a book title, say, Amazing Tales. In the next box, imagine that the book price is something like $45.89. The make of the shoe is Nike. Finally, the price is something like $87.99. When you click on the Shoe Formatted button, you'll see the screen shown in the following screenshot:

Figure 6.10.5: The results of running our program

This confirms that the correct derived version of GetDesc, in the public override string GetDesc() line, has been called. So, again, to stress this ...