4. In this exercise, you modify the eBook Collection application from this lesson. Use Windows to make a copy of the Ebook Solution folder. Rename the copy Ebook Solution-No Duplicate. Open the Ebook Solution (Ebook Solution.sln) file contained in the Ebook Solution-No Duplicate folder. Before getting the author’s name and the price, the btnAdd_Click procedure should determine whether the eBook’s title is already included in the list box. If the list box contains the title, the procedure should display an appropriate message, and it should not add the eBook to the list. Save the solution, and then start and test the application. Close the Code Editor window and then close the solution.