CS411 Assignment 1 Solution Fall 2026

This assignment requires the development of a Library Management System using C# to demonstrate core object-oriented programming concepts. You will implement a base class named LibraryItem and two derived classes, Book and Magazine, to manage library information. The system must utilize inheritance, method overriding, and runtime polymorphism. Finally, you will create a Library class with an indexer to store and retrieve these items, producing a console application that displays item details.

1. 1

   Base Class – LibraryItem

   Create a class named LibraryItem with auto-implemented properties for ItemID, Title, and Author. Include a parameterized constructor to initialize these fields and a virtual Display() method to output the item information.

2. 2

   Derived Class – Book

   Create a Book class that inherits from LibraryItem and adds an auto-implemented property for NumberOfPages. Implement a parameterized constructor that calls the base class constructor and override the Display() method to include the page count.

3. 3

   Derived Class – Magazine

   Create a Magazine class that inherits from LibraryItem and adds an auto-implemented property for IssueNumber. Implement a parameterized constructor that calls the base class constructor and override the Display() method to include the issue number.

4. 4

   Main Class – Objects and Polymorphism

   In the Main() method, demonstrate runtime polymorphism by assigning Book and Magazine objects to a LibraryItem reference variable and calling the Display() method. Additionally, create a Library class with an indexer to store these two objects in an array, then use a loop to retrieve and display them via the indexer.

What to submit

One MS Word document containing the source code and output.

Topics covered

C# console application Inheritance Runtime polymorphism Method overriding Auto-implemented properties Indexers Parameterized constructors