public BookShelf(string currentUsername)
        {
            InitializeComponent();
            this.username     = currentUsername;
            dynamoDbOperation = new DDBOperation();
            string userFirstName = dynamoDbOperation.GetFirstName(username);

            Firstlbl.Content = userFirstName + "!";

            //Loading the Book Shelf of the User
            BooksIntoDataGrid();

            //Adding date and time inside the ReadDateTime textbox
            datetimeTxt.Text = DateTime.Now.ToString();
        }