public OperationResult EditBook(Book book, string userName, string guid) { if (!CheckAuthenticated(userName, guid)) { return(new OperationResult(Library.Models.OperationResult.ErrorEnum.NotAuthenticated, "Please authenticate first!")); } if (book == null || !book.ValidateEdit()) { return(new OperationResult(Library.Models.OperationResult.ErrorEnum.InvalidInputData, "Invalid or missing book data")); } try { using (BookData bookData = new BookData()) { bookData.EditBook(book); return(new OperationResult()); } } catch (Exception ex) { return(new OperationResult(Library.Models.OperationResult.ErrorEnum.InternalProblem, "Some internal problem has occured")); } }