Write a complete C# Windows Forms or WPF application

1. Using your class diagram from the previous assessment, write a complete C# Windows Forms or WPF application that provides the functionality specified in the requirements brief. Your basic program MUST include the following features:a. Display a GUI frontend that the user can interact with to choose menu items and place an order.b. At the start, the program should read the available menu from a text file and display the list of menu items on the screen.c. Use an array of objects to hold details about the menu items.d. The GUI frontend should call the appropriate methods from the classes to perform the requested function. (eg. Update order total, or print invoice.)e. Use sequence and selection logic to allow the user to add and remove menu items from their order.f. Use iteration logic to display the user’s selections on the screen and the invoice.g. When the user confirms the order, write the invoice details to a text file.2. Enhance your program to include the extended functionality. Your program should:a. Use inheritance between two classes. (For example, Pizza class could be a child class of the Food item class.)b. Use polymorphism so that the subclass overrides a method of the parent class. (This could be the constructor or another method.)3. Comment your program to explain the purpose of the code. Every class and every method should be documented. Include single-line, multi-line and documentation comments to help other programmers understand your application. Generate API documentation for your program.4. Debug and test your program. Create and conduct simple unit tests to ensure that your program meets the requirements. Create a set of test data for comparing expected result with actual result. Provide evidence of your test cases and results

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