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Building a Web 2.0 Portal

with ASP.NET 3.5

Omar AL Zabir

Beijing • Cambridge • Farnham • Köln • Paris • Sebastopol • Taipei • Tokyo

Building a Web 2.0 Portal with ASP.NET 3.5

by Omar AL Zabir

Printed in the United States of America.

Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.

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Production Editor: Laurel R.T. Ruma

Copyeditor: Laurel R.T. Ruma

Proofreader: Mary Brady

Indexer: John Bickelhaupt

Cover Designer: Karen Montgomery

Interior Designer: David Futato

Illustrators: Robert Romano and Lesley Borash

Printing History:

December 2007:

First Edition.

Nutshell Handbook, the Nutshell Handbook logo, and the O’Reilly logo are registered trademarks of

O’Reilly Media, Inc. Building a Web 2.0 Portal with ASP.NET 3.5 , the image of a giant green sea

anemone, and related trade dress are trademarks of O’Reilly Media, Inc.

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trademarks of Microsoft Corporation.

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While every precaution has been taken in the preparation of this book, the publisher and author assume

no responsibility for errors or omissions, or for damages resulting from the use of the information

contained herein.

This book uses RepKover, a durable and flexible lay-flat binding.

ISBN-10: 0-596-51050-0

ISBN-13: 978-0-596-51050-3

[C]

Table of Contents

Preface

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1. Introducing Web Portals and Dropthings.com

. . . . . . . . . . . . . . . . . . . . . . . . . .

Defining a Web Portal

Defining a Web 2.0 Portal

Using a Web Portal

Navigating Dropthings

Using ASP.NET AJAX

Using C# 3.0 and .NET 3.5

Summary

2. Architecting the Web Portal and Widgets

. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using a Widget Framework

Adding Widgets

Maximizing the First-Visit Experience

Rendering a Second-Visit Experience

Improving ASP.NET AJAX Performance

Adding Authentication and Authorization

Preventing Denial-of-Service Attacks

Summary

3. Building the Web Layer Using ASP.NET AJAX . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Implementing the Start Page of a Web Portal 41

Building a Custom Drag-and-Drop Extender for a Multicolumn Drop Zone 60

Implementing WidgetContainer

Building Widgets

Page Switching: Simulating a Nonpostback Experience

vii

Using the Profile Object Inside a Web Service

Implementing Authentication and Authorization

Implementing Logout

Summary

100

4. Building the Data and Business Layers Using .NET 3.5

. . . . . . . . . . . . . . . . .

101

Introducing LINQ to SQL

101

Building the Data Access Layer Using LINQ to SQL

104

Introducing Windows Workflow Foundation

112

Building the Business Layer Using WF

113

Implementing the DashboardFacade

127

Summary

133

5. Building Client-Side Widgets

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

134

Delaying Server-Side Widget Loading

135

Content Proxy

138

Building a Client-Side RSS Widget

142

Building a Client-Side Flickr Widget

146

Summary

151

6. Optimizing ASP.NET AJAX

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

152

Combining Multiple Ajax Calls into One Call

152

Timing and Ordering Ajax Calls to the Server

154

Using HTTP GET Calls Instead of HTTP POST

165

Working with the this Function

166

Summary

168

7. Creating Asynchronous, Transactional, Cache-Friendly Web Services

. . . .

169

Scalability Challenges with Web Services

169

Asynchronous Web Methods

171

Modifying the ASP.NET AJAX Framework to Handle Web Service Calls

175

Developing Your Own Web Service Handler

177

Making an Asynchronous and Cache-Friendly Proxy

189

Scaling and Securing the Content Proxy

191

Summary

196

viii

Table of Contents

8. Improving Server-Side Performance and Scalability

. . . . . . . . . . . . . . . . . . .

197

Instrumenting Your Code to Identify Performance Problems

198

Optimizing the HTTP Pipeline

199

Optimizing ASP.NET 2.0/3.5 Before Going Live

200

Optimizing Queries in the ASP.NET Membership Tables

201

Optimizing the ASP.NET 2.0/3.5 Profile Provider Before You Go Live

203

ASP.NET Production Challenges

219

Redirecting Traffic from an Old Web Site to a New One

221

Summary

223

9. Improving Client-Side Performance

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

224

Understanding Web Caching

224

Content Delivery Networks

234

Optimizing Internet Explorer JavaScript Performance

238

Reducing the Web Service Call Payload

246

Loading the UI on Demand

247

Using Read-Ahead Caching for Ajax Calls

250

Hiding HTML Inside <textarea>

250

Summary

253

10. Solving Common Deployment, Hosting, and Production Challenges

. . . . .

254

Deploying Your Web Site in a Web Farm

254

Thirteen Production Disasters That Could Happen at Anytime

260

Choosing the Right Hosting Provider

272

Choosing a Web Site Monitoring Tool

274

Configuring Proper Performance Counters

276

Summary

282

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

283

Table of Contents

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