Create a Windows Forms application. Use the following names for the project and solution, respectively: Playground Project and Playground Solution. Save the application in the VB2017\Chap10 folder. The application should display the area of a triangular playground in square feet. It should also display the cost of covering the playground with artificial grass.
a. Create a suitable interface. Provide list boxes for the user to enter the playground’s base and height dimensions in yards. Both list boxes should display numbers from 20 to 50 in increments of 0.5. Also, provide a list box for entering the price per square foot. This list box should display numbers from 1 to 6 in increments of 0.5.

b. Create a class named Triangle. The Triangle class should verify that the base and height dimensions are greater than 0 before assigning the values to the Private variables. (Although the dimensions come from list boxes in this application, the Triangle class might subsequently be used in an application whose dimensions come from text boxes. Therefore, it is a good idea to verify the user’s input.) The class should also include a default constructor, a parameterized constructor, and a method to calculate and return the area of a triangle. 

c. Code the application. Save the solution and then start and test the application.