A computer's memory can be viewed as a list of cells into which numbers can be placed or read. Each cell has a numbered "address" and can store a single number. The computer can be instructed to "put the number 123 into the cell numbered 1357" or to "add the number that is in cell 1357 to the number that is in cell 2468 and put the answer into cell 1595". The information stored in memory may represent practically anything. Letters, numbers, even computer instructions can be placed into memory with equal ease. Since the CPU does not differentiate between. | Wrox Programmer to Programmer Download this chapter free at http aspnetmvc MVC Rob Conery Scott Hanselman Phil Haack Scott Guthrie wrox Updates source code and Wrox technical support at Professional MVC Published by Wiley Publishing Inc. 10475 Crosspoint Boulevard Indianapolis IN 46256 . Copyright 2009 by Wiley Publishing Inc. Indianapolis Indiana Chapter 1 is licensed under the terms of the Creative Commons Attribution No Derivatives license. Published simultaneously in Canada ISBN 978-0-470-38461-9 Manufactured in the United States of America 10 9 8 7 6 5 4 3 2 1 Library of Congress Cataloging-in-Publication Data is available from the publisher. No part of this publication may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording scanning or otherwise except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act without either the prior written permission of the Publisher or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center 222 Rosewood Drive Danvers MA 01923 978 750-8400 fax 978 646-8600. Requests to the Publisher for permission should be addressed to the Permissions Department John Wiley Sons Inc. 111 River Street Hoboken NJ 07030 201 748-6011 fax 201 748-6008 or online at http go permissions. Limit of Liability Disclaimer of Warranty The publisher and the author make no representations or warranties with respect to the accuracy or completeness of the contents of this work and specifically disclaim all warranties including without limitation warranties of fitness for a particular purpose. No warranty may be created or extended by sales or promotional materials. The advice and strategies contained herein may not be suitable for every situation. This work is sold with the understanding that the publisher is not engaged in rendering legal .