public bool ReturnThisBook(string bookID, string readerID) { BookGateway aBookGateway = new BookGateway(); BookReaderGateway aBookReaderGateway = new BookReaderGateway(); RequestGateway aRequestGateway = new RequestGateway(); if (aBookGateway.UpdateReturnBookQuantity(bookID) && aBookReaderGateway.UpdateBookReaderTakenBook(readerID) && aRequestGateway.ReturnBook(bookID) && aRequestGateway.UpdateReturnDate(readerID)) { return(true); } return(false); }