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CodeNotes for NET 1st Edition Gregory Brill Digital
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Author(s): Gregory Brill
ISBN(s): 9780812991895, 0812991893
Edition: 1
File Details: PDF, 1.62 MB
Year: 2002
Language: english

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OTHER TITLES IN THE CODENOTES SERIES
CodeNotes for J2EE: EJB, JDBC, JSP, and Servlets
CodeNotes for XML
CodeNotes for Java: Intermediate and Advanced Language Features
CodeNotes for VB.NET
CodeNotes for Web-Based UI

CodeNotes®
for .NET
Edited by GREGORY BRILL
N E W Y O R K

As of press time, the URLs displayed in this book link or refer to existing websites on the
Internet. Random House, Inc., is not responsible for the content available on any such site
(including, without limitation, outdated, inaccurate, or incomplete information).
No part of this document may be reproduced or transmitted in any form or by any means,
electronic or mechanical, for any purpose, without the express written permission
of Random House, Inc. Information in this document is subject to change without notice.
While every effort has been made to make this book as accurate as possible,
the authors and the publisher assume no responsibility for errors or omissions,
or otherwise for the use of the information contained herein.
Copyright © 2001 by Infusion Development Corporation
All rights reserved under International and Pan-American Copyright Conventions.
Published in the United States by Random House, Inc., New York, and simultaneously
in Canada by Random House of Canada Limited, Toronto.
Random House Trade Paperbacks and colophon are trademarks of Random House, Inc.
CodeNotes® is a registered trademark of Infusion Development Corporation.
Access, ActiveX, Authenticode, ClearType, DirectX, FrontPage, Internet Explorer,
JScript.NET, Microsoft, MS-DOS, MSDN, Outlook, PowerPoint, SQL Server, Visual Basic,
Visual Basic.NET, VBScript, Visual C#.NET, Visual C++, Visual C++.Net, Visual InterDev,
Visual Studio, Visual Studio.NET, Win32, Win64, Windows, Windows 95, Windows 98, Win-
dows 2000, Windows Me, Windows NT, and Windows XP are registered trademarks or trade-
marks of Microsoft Corporation in the United States and/or other countries.
Java and JavaServer Pages are trademarks or registered trademarks of Sun Microsystems, Inc.,
in the U.S. and other countries.
Library of Congress cataloging-in-publication data is available.
e-ISBN 0-679-64725-2
Website address: www.atrandom.com
v1.0
Cover design: Kapo Ng

Using CodeNotes
PHILOSOPHY
The CodeNotes philosophy is that the core concepts of any technology
can be presented succinctly. Building from many years of consulting
and training experience, the CodeNotes series is designed to make you
productive in a technology in as short a time as possible.
CodeNotes Pointers
Throughout the book, you will encounter CodeNotes Pointers: (e.g.,
aNET010010). These pointers are links to additional content available
online at the CodeNotes website. To use a CodeNotes Pointer, simply
point a web browser to www.CodeNotes.com and enter the Pointer num-
ber. The website will direct you to an article or an example that provides
additional information about the topic.
CodeNotes Style
The CodeNotes series follows certain style guidelines:
• Code objects and code keywords are highlighted using a special
font. For example: System.Object.
• Code blocks, screen output, and command lines are placed in in-
dividual blocks with a special font:
//This is an example code block

WHAT YOU NEED TO KNOW BEFORE CONTINUING
The .NET Framework encompasses concepts ranging from distributed
computing to database access to public key cryptography. Because the
topics are so varied, the CodeNotes format is compressed and certain
background information has been omitted. However, a significant num-
ber of examples and background articles can be found on the CodeNotes
website (www.CodeNotes.com).
viii . Using CodeNotes

About the Authors
SHELDON FERNANDEZ is Senior Developer at Infusion Development
Canada in Toronto, Ontario. He has developed software for Silicon Val-
ley startups as well as financial and medical institutions in the United
States and Canada. He has worked with Microsoft technology for many
years, from his very first QuickBasic compiler to the latest suite of .NET
development tools. Sheldon holds a Computer Engineering degree from
the University of Waterloo and was the chief researcher on Applying
COM+, a definitive work on Microsoft’s enterprise component tech-
nology.
DEREK BARNES works as a Consultant for Infusion Development Corpo-
ration. In both Canada and the United States, he has worked on major
e-commerce sites and the infrastructure for large financial institutions.
His hobbies include piano, numerical analysis, and German and Chinese
literature. Derek currently lives in Manhattan’s Chinatown.
GREGORY BRILL is president of Infusion Development Corporation, a
firm specializing in architecting global-securities-trading and analytic
systems for several of the world’s largest investment banks in the United
States and Tokyo. He has written articles for C++ Users Journal and is
the author of Applying COM+. He lives in New York City.
More information about the authors and Infusion Development Corpo-
ration can be found at www.infusiondev.com/codenotes.

Acknowledgments
First, thanks to John Gomez who saw the potential of the CodeNotes
idea before anyone else and introduced me to Random House. Without
John, there would be no CodeNotes. John, you are a true friend, a real
visionary. I’d also like to thank Annik LaFarge, who fearlessly champi-
oned the series and whose creativity, enthusiasm, and publishing savvy
has been instrumental in its creation. Thank you to Mary Bahr, our un-
flappable editor, who paved the way and crafted the marketing. Thank
you to Ann Godoff, whose strength, decisiveness, and wisdom gave
CodeNotes just the momentum it needed. And, of course, the produc-
tion, sales, and business teams at Random House, with particular thanks
to Howard Weill, Jean Cody, and Richard Elman.
On the Infusion Development side, thank you to Sheldon Fernandez
and Derek Barnes, the writers of this CodeNote, for taking on an impos-
sible task, in an impossible timeframe, and then turning around and de-
livering one of the best technical books I’ve ever read. Sheldon is a great
writer, and Derek a great researcher—the two make an incredible team.
Thank you also to the CodeNotes reviewers, who gave us invaluable
feedback and suggestions on our early drafts. And thank you to the en-
tire cast and crew of Infusion Development Corporation, who have sup-
ported and encouraged this venture throughout. I know CodeNotes was
extremely trying, tough to do, and involved an awesome amount of re-
search, writing, and editing. But here it is . . . as we envisioned it.
Gregory Brill

Contents
Using CodeNotes vii
About the Authors ix
Acknowledgments xi
Chapter 1: An Introduction to the .NET Framework 3
Topic: The Common Language Runtime 10
Topic: .NET Runtime Classes 12
Chapter Summary 17
Chapter 2: Installation 18
Chapter 3: Assemblies and MetaData 22
Topic: Metadata 23
Topic: Shared and Private Assemblies 34
Chapter Summary 46
Chapter 4: .NET Language Features 47
Topic: Attributes 48
Topic: Reflection 53
Topic: Delegates 68
Topic: Garbage Collection 84
Chapter Summary 89

Chapter 5: Migrating Native Code to .NET 90
Topic: PInvoke and DllImport 92
Topic: The COM Interop Service 95
Chapter Summary 102
Chapter 6: ADO.NET 104
Topic: Managed Providers 108
Topic: Datasets 114
Topic: Transactions 122
Chapter Summary 128
Chapter 7: Windows Forms 129
Topic: Visual Inheritance 138
Chapter Summary 144
Chapter 8: ASP.NET 146
Topic: VS.NET Web Forms 156
Topic: ASP.NET Applications and Configuration 163
Chapter Summary 171
Chapter 9: Web Services 172
Topic: HTTP POST and SOAP 182
Topic: WSDL 193
Topic: Web Service Discovery 198
Chapter Summary 204
Index 205
xiv . Contents

Chapter 1
AN INTRODUCTION TO THE .NET
FRAMEWORK
WHAT IS .NET?
.NET is Microsoft’s new strategy for the development and deployment
of software. Depending on your interests and development background,
you may already have a number of preconceived notions regarding
.NET. As we will see throughout this CodeNote:
• .NET fundamentally changes the way applications execute under
the Windows Operating System.
• With .NET Microsoft is, in effect, abandoning its traditional
stance, one which favors compiled components, and is embrac-
ing interpreted technology (similar, in many ways, to the Java
paradigm).
• .NET brings about significant changes to both C++ and Visual
Basic, and introduces a new language called C# (pronounced
“C sharp”).
• .NET is built from the ground up with the Internet in mind, em-
bracing open Internet standards such as XML and HTTP. XML
is also used throughout the framework as both a messaging in-
strument and for configuration files.
These are all noteworthy features of .NET, or more accurately the .NET
Framework, which consists of the platform and tools needed to develop

and deploy .NET applications. The .NET Framework can be distilled
into the following three entities:
1. The Common Language Runtime (CLR), which is the execu-
tion environment for all programs in the .NET Framework. The
CLR is similar to a Java Virtual Machine (VM) in that it inter-
prets byte code and executes it on the fly, while simultaneously
providing services such as garbage collection and exception
handling. Unlike a Java VM, which is limited to the Java lan-
guage, the CLR is accessible from any compiler that produces
Microsoft Intermediate Language (IL) code, which is similar to
Java byte code. Code that executes inside the CLR is referred to
as managed code. Code that executes outside its boundaries is
called unmanaged code.
2. The Runtime classes, which provide hundreds of prewritten ser-
vices that clients can use. The Runtime classes are the building
blocks for .NET applications. Many technologies you may have
used in the past (ADO, for example) are now accessed through
these Runtime classes, as are basic operations such as I/O. Tra-
ditionally, every language had its own unique supporting li-
braries, accessible only from that particular language. String
manipulation, for example, was afforded to VB programmers
via the Visual Basic runtime, whereas C++ programmers de-
pended on libraries such as STL for similar functionality. The
.NET Runtime classes remove this limitation by uniformly of-
fering services to any compiler that targets the CLR. Those fa-
miliar with Java will find the Runtime classes analogous to the
Java Class Libraries.
3. Visual Studio.NET (VS.NET), which is Microsoft’s newest ver-
sion of Visual Studio. VS.NET includes VB.NET, “managed”
C++, and C#, all of which translate source code into IL code.
VB.NET and VC.NET are the new versions of Visual Basic and
Visual C++, respectively. C# is a new Microsoft language that at
first glance appears to be a hybrid of C++ and Java. .NET de-
velopment does not have to be limited to these languages, how-
ever. Any component or program produced by an IL-aware
compiler can run within the .NET Framework. (As of this writ-
ing, other companies have announced IL compilers for Perl,
Python, and COBOL.) VS.NET also comes with a fully Inte-
grated Development Environment (IDE), which we will exam-
ine in Chapter 7. Note the VS.NET IDE now houses the
development environments for both Visual C++ and Visual
Basic.
4 . CodeNotes® for .NET

OUTLINE OF THE BOOK
In this chapter we will examine the three fundamentals of the .NET
Framework previously listed.
Chapter 2 provides brief installation instructions. Because .NET was
still in beta release at the time of writing, these instructions may be out
of date. Readers are encouraged to consult the online instructions at
aNET010001.
One of the goals of .NET was to eliminate the versioning problems of
traditional Win32 DLLs (a problem sometimes referred to as DLL Hell).
This is realized through a new type of component in the .NET Frame-
work called the assembly, the subject of Chapter 3. .NET eradicates
DLL Hell from the Windows environment by enforcing the versioning
of assemblies through public key cryptography.
In Chapter 4, we will look at some of the new language features in the
.NET Framework, such as attributes, which are nonprogrammatic code
statements that can be used to influence application behavior, and dele-
gates, the new type-safe callback mechanism in the managed environ-
ment. Garbage collection, a service performed by the CLR, will also be
investigated, as will reflection, the ability to ascertain type information
about an application at runtime.
The .NET Framework does not preclude the use of traditional COM
and Win32 components that have already been developed. Mechanisms
exist to allow these “unmanaged” components (those that do not run
under the auspices of the CLR) to run alongside their .NET counter-
parts. Such mechanisms will be investigated in Chapter 5.
Chapter 6 looks at ADO.NET, the new data access model for the
.NET Framework. ADO.NET is a disconnected data access model,
which means that data manipulation is performed outside the context of
an open database connection. This model is especially appropriate for
web applications that are loosely coupled to their data sources. As its
name suggests, ADO.NET is an evolution of Microsoft’s ActiveX Data
Object (ADO) model.
.NET also exposes new methodologies for developing standard
Win32 applications. Windows Forms, the subject of Chapter 7, is the
new way to construct desktop GUI applications for the Windows envi-
ronment.
Internet developers will also welcome Web Forms, which brings the
traditional ease and versatility of Visual Basic forms to Internet applica-
tions. Web Forms is a feature of ASP.NET, the topic of Chapter 8.
ASP.NET is Microsoft’s new generation Active Server Page (ASP)
framework for developing robust web applications.
Chapter 9 examines Web Services and an emerging communication
An Introduction to the .NET Framework . 5

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