The ElGrande Hotel has 8 floors and 30 rooms on each floor. Create an application that calculates the occupancy rate for each floor, and the overall occupancy rate for the hotel. The occupancy rate is the percentage of rooms occupied, and may be calculated by dividing the number of rooms occupied by the number of rooms. For example, if 18 rooms on the first floor are occupied, the occupancy rate is as follows:

18 / 30 = 0.6 or 60%

On startup, the applications form should appear similar to the one shown below. Each time the user enters the occupancy for a single floor and clicks the Save button, the floor number in the ComboBox should increment automatically (just add 1 to its SelectedIndex property), and a new line should appear in the ListBox with the percentage occupancy. Also, the contents of the TextBox at the top of the form should clear automatically when the user clicks the Save button, so the user does not accidentally enter the same data twice in a row. The Restart button should clear all the appropriate controls on the form. The Exit button should end the application.

- Hint: Use .TryParse to validate number of rooms. The room number should between 0 and 30. - Hint: Near the end of Save button handler, increase comboBox floor number by 1 if comboBox selectedIndex value is less than the highest index number. - Overall room number variable (accumulator) should be declared in the global area (not to lose the current value whenever save button handler is executed). - Two big border boxes that hold multiple controls in them are GroupBox control - Containers group of Toolbox. The only property that should be entered is a Text property - you can visually control the size of the GroupBox that provides the borders.