ASP.NET Website Programming: Problem - Design - Solution VB.NET Edition / Edition 1

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Overview

What is this book about?

The C# edition of ASP.NET Website Programming Problem-Design-Solution has been phenomenally successful, gaining rave reviews for its unique approach and valuable content. The blend of theory and practice.

Now, due to demand from readers, a Visual Basic .NET edition of the book has been produced. This edition will offer the same blend of theory and practice that won so many fans for the C# edition. The book has been completely re-edited to ensure that it address the needs of ASP.net developers who use VB.net.

ASP.NET Website Programming shows you how to build an interactive website from design to deployment.

Packed with solutions to website programming problems, this book will have you building well-engineered, extendable ASP.net websites quickly and easily.

What does this book cover?

In this book, you will learn how to 

  • Establish a solid, scalable website foundation
  • Provide flexible user accounts integrating with ASP.net's built-in security
  • Create message forums that enable formatted messages but defend against cross-site scripting
  • Generate revenue from advertising
  • Build a web interface for uploading, downloading, editing, and managing the files on your site
  • Add opinion polls, email newsletters, and news management
  • Deploy the finished site on a live server
  • Build websites using good, n-tier coding techniques

The site that you build is modular. You can slot the modules into your own Web site, modify them, or use them as examples of particular ASP.NET techniques.

The code will work with Visual Basic .NET Standard. However, Chapter 11 "Deploying the Site" uses some features found only in the full Visual Studio .NET. You will still be able to deploy the site, but the process will be less automated.

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Product Details

  • ISBN-13: 9781861008169
  • Publisher: Wrox Press, Inc.
  • Publication date: 12/24/2002
  • Edition number: 1
  • Pages: 500
  • Product dimensions: 7.24 (w) x 8.93 (h) x 1.26 (d)

Meet the Author

Marco Bellinaso lives in a small town close to Venice, Italy. He works as a software developer and trainer for Code Architects Srl (www.codearchitects.com), an Italian company that specializes in .NET. He has been working with VB, C/C++, ASP, and other Microsoft tools for several years, specializing in User Interface, API, and ActiveX/COM design and programming, but is now spending all his time on the .NET Framework, using C# and VB.NET.
He's been working with the .NET Framework since the Beta 1, and is now particularly interested in e-commerce design and implementation solutions with SQL Server, ASP.NET, and web services, with both C# and VB.NET. He is part of the VB-2-The-Max team (www.vb2themax.com), a popular website for VB and .NET developers, for which he writes articles and commercial software, such as add-ins for MS Visual Studio and other utilities for VB and .NET developers. In particular, he co-authored the award-winning VB Maximizer VB6 add-in.

Kevin Hoffman has always loved computers and computer programming. He first got hooked when he received a Commodore VIC-20 from his grandfather, who had repaired it after finding it in the trash. He then started a prolific but unprofitable career writing shareware games and utilities for electronic bulletin board systems.
He started working as a programmer while still in college, writing computer interfaces to solar measurement devices and various other scientific instruments. Moving to Oregon, he did everything from technical support to tuning Unix kernels, and eventually working as an ASP programmer for 800.COM, a popular on-line electronics retailer. From there he moved on to working on large, enterprise ASP applications.
Then he finally found .NET, which he now spends 100% of his programming and learning efforts on. A big C# fan, who would use it to do everything including brush his teeth if only he could figure out how, Kevin has been writing on .NET for Wrox since the middle of Beta 1. He plans to continue until we get tired of him. He's currently in Houston, Texas sweating a lot and working on web services and other large-scale .NET applications.

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Table of Contents

Introduction 1
Ch. 1 Building an ASP.NET Website 9
Ch. 2 Foundations 17
Ch. 3 Foundations for Style and Navigation 45
Ch. 4 Maintaining the Site 73
Ch. 5 Users and Authentication 139
Ch. 6 News Management 201
Ch. 7 Advertising 287
Ch. 8 Polls 319
Ch. 9 Mailing Lists 393
Ch. 10 Forums and Online Communities 445
Ch. 11 Deploying the Site 509
Ch. 12 The End 521
Index 525
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First Chapter

ASP.NET Website Programming

Problem - Design - Solution, Visual Basic .NET Edition
By Marco Bellinaso Kevin Hoffman

John Wiley & Sons

ISBN: 0-7645-4386-5


Chapter One

Building an ASP.NET Website

In this book we are going to build a content-based ASP.NET website. This website will consist of a number of modules, which will all fit together to produce the finished product.

We will build each module in a standard order:

Identify the problem - What do we want to do? What restrictions or other factors do we need to take into account?

Produce a design - Decide what features we need to solve the problem. Get a broad idea of how the solution will work.

Build the solution - Produce the code, and any other material, that will realize the design.

This book focuses on programming. When we talk about design, we generally mean designing the software - we will not be looking at graphic or user interface design.

Your website will not be solving all of the same problems as ours, but many of the modules we build - and the programming techniques we use - are very transferable.

In this chapter we will take a high-level look at the whole site - what it needs to do, and how it will do it.

The Problem

We will be building a website for DVD and book enthusiasts. In outlining the site's problem, we need to consider the purpose and audience. In real life this stage would be business oriented - taking into account things like advertising demographics, competition, and availability of funding. These processes need to be analyzed rigorously, but we will leave all that to the managers.

Our site will cater for lovers of books and DVDs. It will provide useful content and try to build community. Our visitors will want to read about these things, and contribute their opinions, but each visit will be fairly short - this will not be a huge database in the style of the Internet Movie Database (imdb.com). It will be funded by advertising, and will rely on repeated (but fairly short) visits from its readers.

We also need to consider constraints. These are more practical. One of the major constraints that this site faced was the development team - the members would never meet, because they were on opposite sides of the world. This meant that the design must allow one developer to work on sections of the site without interfering with other developers working on different sections. But all of the sections needed to eventually work together smoothly. In most cases the separation between developers will be less extreme, but giving each developer the ability to work independently is very useful. We need to design and build methods to enable this.

Site development never really finishes - sites tend to be tweaked frequently. Another key to successful websites is to design them in a way that makes modification easy. We will need to find ways to do this.

The Design

We have outlined what our site needs - now let's look at how we can provide it. The main points raised in the problem section were:

Enable developers to work from many different locations

Build a maintainable, extendable site

Build community

Provide interesting content

Provide revenue through advertising

Encourage frequent visits

Let's discuss each of these in turn.

Working from Different Locations

Our developers need to work on sections of the site with relatively little communication. Our developers are in different countries so face-to-face meetings are impossible. Telephone conversations can be expensive, and different time zones cause problems.

We need to design the system so that developers can work on their own section of the site, knowing that they will not damage the work of others.

A good way to solve this is to develop the site as a series of modules, with each module being fairly independent. Of course there will be shared components, but changes to these will be rare and can be done in a controlled way. In this book, we work in modules. We also make frequent use of controls. This means that components for a page can be developed independently, and easily 'dropped in' as needed - changes to the actual pages of the site are kept to a minimum.

A Maintainable, Extendable Site

Most websites have new features added quite frequently. This means that from the start the site needs to be designed to make that easy.

Working in modules and using controls already goes some way towards this. Particularly, using controls means that non-programmers can edit the pages of our site more easily - nearly all they see is HTML code. A control just looks like another HTML tag.

Working in modules means that new modules can be added to the site at any time, with minimum disruption. All modules are fairly independent, so new ones can be added - and changes made - pretty easily.

Each individual module needs to be easy to change. A good way to do this is to work in layers, or 'tiers'. We will be using a three-layer design for most modules. We have a data layer, a business layer, and a presentation layer. Data passes from data layer to business layer, and from business layer to presentation layer, and back again. Each layer has a job to do. Underneath the data layer is a data source, which it is the data layer's job to access.

The data layer obtains fairly raw data from the database (for example, "-10"). The business layer turns that data into information that makes sense from the perspective of business rules (for example, "-10 degrees centigrade"). The presentation layer turns this into something that makes sense to users (for example, "Strewth! It's freezing!").

It's useful to do this, because each layer can be modified independently. We can modify the business layer, and provided we continue to accept the same data from the data layer, and provide the same data to the presentation layer, we don't need to worry about wider implications. We can modify the presentation layer to change the look of the site, without changing the underlying business logic.

This means we can provide versions of the site for different audiences. We just need new presentation layers that call the same business objects. For example, providing different languages: "Zut alors! Comme il fait froid!", "Allora, è freddo!", and so on.

We need methods to get changes we make onto the live site. This could be through FTP uploads, but in many circumstances it is better to work through a web interface.

We will also need tools to administer the other sections - ban problem users, add news articles, and so on. This is all part of providing a maintainable site.

Community

Sites generally benefit from allowing readers to contribute. Because our site is not intended for users to spend hours looking at, our community features must not require a lot of users' time.

There are two ways that we will build our community: through polls and forums. Polls give users the opportunity to give their opinion in a single click - so they require very little time from the user, but can make a site seem far more alive.

Forums enable users to discuss topics with other users. Messages remain in the system, and replies are posted. Readers can leave a post, and then come back later to see if there are replies. This is more appropriate for our purposes than a chat room, which requires the reader to concentrate on the site for the whole duration of the chat.

Community can really give a site a life of its own. Over time, strong characters, heroes, and villains emerge. Many sites depend entirely on community, and become extremely popular - for example plastic.com.

For any of this to work, we need to identify users and provide them with unique logons. So our system will need some form of user accounts system.

Interesting Content

The content most relevant to our users will be movie- and-book-related news and reviews. This content tends to be highly relevant for a short period of time: after a story has broken, or immediately after a release. Our site will need tools to manage news in this way.

Another way to provide interesting content is to get somebody else to provide it! This is part of what we're doing with our community section. Part of the purpose of building community is to get people contributing content.

Advertising

Advertising generates revenue (or in some cases it is used to exchange banners with other sites). We need to display adverts, and record data about how often each advert has been displayed and clicked on.

We also need to gather information about what the users of the site like, so we can target our advertising content. Polls and forums can provide us with useful information when finding products to advertise.

The biggest sites target individual users based on their demographic and any other information gathered about them (for example, Yahoo! and Amazon.com target advertising and product recommendations to the demographic and buying habits of each user). Our site already has a fairly narrow target demographic, and is not particularly big, so we don't need to do this.

Frequent Visits

A good site will make people want to return. If the content is compelling, and there's plenty of discussion going on, then people visit again and again.

It's still a good idea to remind users from time to time. We want to draw attention back to the site, even when the user isn't viewing it. One way we'll be doing this is through an e-mail newsletter, which gives users useful information and subtly reminds them to visit the site.

We will also build a Windows application that acts as a news ticker, with automatically updating news headlines. Users can click a headline to view the full story on the site.

The Solution

We've seen what we want the site to do, and sketched out some rough ideas of how we might provide it. Now we'll look at how to build our solution. This really encompasses the whole of the book. Here we'll look at how each chapter relates to our initial problem and design.

Working from Different Locations

In the next two chapters, we will provide a framework for development. This will lay down coding standards, and a framework for organizing the modules into folders and Visual Studio .NET projects.

We will decide what namespaces we will use for each module, and all the other things that will make team working as hassle free as possible. We will also develop some initial UI features to use across the site, promoting a unified feel. These include a header, footer, and navigation control, and stylesheets.

Building a Maintainable, Extendable Site

Chapters 2 and 3 will also set us on the road to a maintainable site. We will develop base classes, giving each new module a solid foundation to build on.

We will develop a web-based file manager in Chapter 4. Through this we can download and upload files, create new ones, move them, change their attributes, and even edit files online with a built in, webbased text editor. If you've ever wanted to provide file upload facilities, offer source code for download, or provide online editing tools then this is the place to look!

Most of the modules we develop will have administration features. For these to be useful, we need to identify administrators. In Chapter 5 we will develop a user accounts system. Using this, we can collect user information and give different users different privileges. Our final site will support full role-based security, with login details stored in a SQL Server database.

Providing Interesting Content

In Chapter 6 we create a news management system. This will enable our administrators to add and edit news articles, receive and approve suggested articles from readers, and place new articles in categories, and of course, it lets users read the news. We will create a control so that we can easily display headlines on any page that we like.

The news system will be flexible enough to also cover reviews, which will eventually form the core of our site.

Managing Adverts

Advertising will be covered in Chapter 7. We will develop a system to display adverts, and log impressions (when an ad is displayed) and hits (when an ad is clicked). This will allow us to create reports from this data to give to advertisers.

There will be admin facilities to create adverts, select how frequently they should be displayed, and start and end campaigns.

Encouraging Community

Chapter 8 will cover our voting system, and forums will be covered in Chapter 10. The voting system will allow administrators to create new questions to vote on. Answers will be recorded and displayed, and an archive of old results maintained - accessible from a standalone Windows application. We guard against multiple votes from the same user by using cookies and IP number.

The forums system will let each user choose an avatar image to represent them, and start posting. Discussion will be organized into categories, and within them there will be various topics. Users can post new topics, and reply to existing topics. We use regular expressions to allow formatting tags in messages, but prevent images or JavaScript.

Getting Repeat Visitors

As well as providing all this great content, we will include two features specifically for getting visitors back to the site.

The first is covered in Chapter 6 where we look at news. We will develop a web service that exposes our news headlines. We will then build a Windows client that displays the headlines, updating itself regularly. Clicking a headline will open a browser on the correct page for the full story.

The second is covered in Chapter 9. We will create the facility for visitors to subscribe to receive e-mail updates from us. Once they are subscribed, we send a mail out regularly to encourage repeat visits. This mail will include highlighted news and features, and links back to the site. We will develop a system that enables administrators to create plain text and HTML messages. We then develop a mailing list admin module for creating subscription forms for new mailing lists, administering list members, adding newsletters, and managing subscriptions. Messages can include custom tags so that each list member receives an e-mail tailored to their own details.

Deploying the Site

Although we haven't mentioned it before, we will eventually need to move the site from our production machine to the live server. This can be a complex task, because we need to separate the files needed for the site to run from the source code files that we only need for development. We will look at this in Chapter 11, and see how Visual Studio .NET gives us tools to make the process easy.

Summary

We're now ready to look at the site in detail. Before reading the following chapters, it's worth getting hold of the code download and seeing how the final site fits together.

Continues...


Excerpted from ASP.NET Website Programming by Marco Bellinaso Kevin Hoffman Excerpted by permission.
All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
Excerpts are provided by Dial-A-Book Inc. solely for the personal use of visitors to this web site.

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