Create a C# application named ShapesDemo that creates several objects that descend from an abstract class called GeometricFigure. Each GeometricFigure includes a height, a width, and an area. Provide get and set accessors for each field except area; the area is computed and is read-only. Include an abstract method called ComputeArea() that computes the area of the GeometricFigure. Next you will create three additional classes derived from the GeometricFigure class. Name these derived classes: Rectange, Square, and Triangle. using static System.Console; class ShapesDemo {    static void Main()    {        // Your code here    } }

Write an application for Nina’s Cookie Emporium named CookieDemo that declares and demonstrates objects of the CookieOrder class and its descendants. The CookieOrder class includes the following auto-implemented properties: OrderNum - The order number Name - The recipient’s name CookieType - The cookie type (for example, chocolate chip) The class should also include fields for number of dozens ordered and price (named Dozens and Price). When the field value for number of dozens ordered is set, the price field is set as $15 per dozen for the first two dozen and $13 per dozen for each dozen over two. Next, create a child class named SpecialCookieOrder, which includes a field with a description as to why the order is special (for example, gluten-free). Override the method that sets a CookieOrder’s price as described in the step above, but also to include special handling, which is $10 for orders up to $40 and $8 for higher-priced orders. An example of the program is shown below: Order…

3. Design a user-defined class called Course. Each course object will hold data about a course. The data includes courseID, courseName, credits and instructorName. Define the instance variables required of the appropriate type. Provide only get methods along with toString() and equals() methods. Design another user-defined class called Student. Each student object will hold data on name, GPA and courseList. Make sure to define courseList as an ArrayList holding references to Course objects Implement a constructor that will take values to initialize name, and gpa while courseList is initialized to an ArrayList() object. Provide the following get methods: getStudent ID ( ), getName(), getGPA (), get Gender(), and get CourseList() Note: the getCouresList() method will return a copy of the coureList arraylist with copies of course objects. Provide the following set methods: setName(), setGPA (), setGender() Another method: addCourse () that will take a Course object and add it to the…

Develop a set of classes for a college to use in various student service andpersonnel applications. Classes you need to design include the following:• Person—A Person contains a first name, last name, street address, zip code,and phone number. The class also includes a method that sets each datafield, using a series of dialog boxes and a display method that displays all of aPerson’s information on a single line at the command line on the screen