Question One $(45$ marks$)-$c# code

Case Study $1$: Library Management System with Advanced Features

Background: Richfield library is looking to modernize its operations by developing a

comprehensive Library Management System $($LMS$).$ The system needs to manage the

borrowing and returning of books, track overdue books, generate various reports for library

administrators, and utilize advanced features such as threading, file handling, and delegates

for efficient operations.

Requirements:

$1.$ The system should support multiple users with different roles: Librarian, Member, and

Admin.

$2.$ Members can borrow and return books. Each book has attributes like title, author,

ISBN, and publication year.

$3.$ Librarians can add and remove books from the system.

$4.$ Admins can generate reports on the number of books borrowed, overdue books, and

the most popular books.

$5.$ The system should send notifications to members about overdue books.

$6.$ Implement the use of threading to handle concurrent operations, file handling for data

persistence, and delegates for event$-$driven programming.

Tasks:

$1.$ Design and implement the classes for the LMS$,$ including User, Member, Librarian,

Admin, Book, and Library. Utilize inheritance where appropriate.

$2.$ Implement threading to handle multiple members borrowing and returning books

concurrently.

$3.$ Use file handling to save and retrieve book and user data to and from a file.

$4.$ Implement delegates to notify members about overdue books and to generate

reports.

Questions:

$1.$ Class Design, Inheritance, and File Handling:

o Implement the class hierarchy for the LMS$.$ Ensure that the User class is

abstract and that Member, Librarian, and Admin classes inherit from it$.$ Each

class should have appropriate properties and methods.

o Write a method in the Library class that allows a Librarian to add a new Book

to the system and save the book data to a file. Demonstrate this functionality

with a sample implementation.

$2.$ Threading and Delegates:

o Implement threading in the Library class to handle multiple members

borrowing and returning books simultaneously. Ensure thread safety and

proper synchronization.

o Create a delegate and an event in the Library class to notify Members about

overdue books. Write a method to subscribe members to this event and

demonstrate its functionality.

o Implement a delegate in the Library class for generating different types of

reports based on the role of the user $($e$.$g$.,$ Admin can generate a

comprehensive report while Member can only view their borrowed books$).$

$3.$ Software Development Approach and Life Cycle:

o Explain the software development approach and life cycle model adopted for

the Library Management System.

o Describe the requirements gathering process and techniques used.

o Justify the choice of the development approach and its benefits for the project.

CODE MUST BE IN C# and able to run in visual studio