Online-Bookstore is an ASP.NET web application built with C and Visual Studio as part of a collaboration with the National University of Singapore, Institute of Systems Science. This platform serves as a comprehensive e-commerce solution for managing and browsing a digital book inventory. Core functionalities include secure user identity authentication and a robust login system. Customers can search the catalog, view detailed book information, and manage a dynamic shopping cart. The system supports full inventory management, allowing administrators to add new titles, update existing entries, and upload book images via file upload capabilities. A complete checkout process is integrated to handle order processing. The application relies on a SQL Server database, requiring the import of a backup file to initialize the environment before running within the Visual Studio development server. It demonstrates practical implementation of web development concepts, database interaction, and secure user access control su