Introduction to Visual Basic NET.pdf

Dear Reader,

I wanted to take this opportunity to explain the rationale behind this book

showing up on your shelf for free.

Quite some time ago, Sams Publishing determined that the next big thing

to hit the programmer/developer community would be Microsoft’s Visual

Studio.NET and the .NET Framework. After discussions with many of you,

our authors and key Microsoft team members, Sams dedicated itself to a

strategy that would support your efforts to learn the .NET Framework as

efficiently and as quickly as possible.

A Programmer’s Introduction to Visual Basic.NET is the perfect example

of how our strong relationship with Microsoft and our dedication to bring-

ing you authors who are already respected sources in the community suc-

cessfully blend and show that Sams Publishing is the source for .NET

learning.

Bringing you a Beta2 compliant book by May 2001 was not an easy task.

Sams called upon a respected author, Craig Utley, to take on this project.

Craig holds a unique place in the VB community where he has been devel-

oping in VB since version 1.0. He brings years of experience as a trainer,

writer, and speaker to this project and gives you the solid reference you

need to make the transition from VB to VB.NET.

I hope this book gives you the tools you need to begin to learn VB.NET. I

invite your comments and ideas as I work to make Sams the publisher you

look to as your .NET learning resource.

On behalf of all of the Sams Publishing team,

Paul Boger

Publisher

Sams Publishing

E-mail Paul.Boger@samspublishing.com

Mail

Paul Boger

Publisher

Sams Publishing

201 West 103rd Street

Craig Utley

Visual Basic.NET

201 West 103rd Street

Indianapolis, IN 46290 USA

A Programmer’s Introduction to

A Programmer’s Guide to Visual Basic.NET

E XECUTIVE E DITOR

Shelley Kronzek

D EVELOPMENT E DITOR

Kevin Howard

retrieval system, or transmitted by any means, electronic, mechanical,

photocopying, recording, or otherwise, without written permission from

the publisher. No patent liability is assumed with respect to the use of the

information contained herein. Although every precaution has been taken in

the preparation of this book, the publisher and author assume no responsi-

bility for errors or omissions. Nor is any liability assumed for damages

resulting from the use of the information contained herein.

International Standard Book Number: 0-672-32203-X

Library of Congress Catalog Card Number: 2001087650

Printed in the United States of America

First Printing: May 2001

04 03 02 01

M ANAGING E DITOR

Charlotte Clapp

P ROJECT E DITOR

Carol Bowers

C OPY E DITOR

Michael Henry

I NDEXER

Eric Schroeder

T ECHNICAL E DITOR

Boyd Nolan

4 3 2 1

T EAM C OORDINATOR

Pamalee Nelson

Trademarks

I NTERIOR D ESIGNER

Gary Adair

All terms mentioned in this book that are known to be trademarks or ser-

vice marks have been appropriately capitalized. Sams Publishing cannot

attest to the accuracy of this information. Use of a term in this book

should not be regarded as affecting the validity of any trademark or ser-

vice mark.

C OVER D ESIGNER

Gary Adair

P AGE L AYOUT

Gloria Schurick

Warning and Disclaimer

Every effort has been made to make this book as complete and as accurate

as possible, but no warranty or fitness is implied. The information pro-

vided is on an “as is” basis. The author and the publisher shall have nei-

ther liability nor responsibility to any person or entity with respect to any

loss or damages arising from the information contained in this book.

Overview

Foreword viii

Introduction 1

1 Why Should You Move to Visual Basic.NET? 3

2 Your First VB.NET Application 21

3 Major VB.NET Changes 49

4 Building Classes and Assemblies with VB.NET 73

5 Inheritance with VB.NET 91

6 Database Access with VB.NET and ADO.NET 105

7 Building Web Applications with VB.NET and ASP.NET 133

8 Building Web Services with VB.NET 153

9 Building Windows Services with VB.NET 165

10 Upgrading VB6 Projects to VB.NET 175

A The Common Language Specification 187

Index 191

Contents

I NTRODUCTION 1

1W HY S HOULD Y OU M OVE TO V ISUAL B ASIC .NET? 3

Visual Basic.NET: A New Framework ....................................................3

The Common Language Runtime............................................................6

Managed Execution ................................................................................8

Microsoft Intermediate Language (MSIL) ........................................8

The Just-In-Time Compiler ................................................................9

Executing Code ..................................................................................9

Assemblies........................................................................................10

The Common Type System ..................................................................12

Classes ..............................................................................................13

Interfaces ..........................................................................................13

Value Types ......................................................................................14

Delegates ..........................................................................................14

The .NET Framework Class Library ....................................................14

Self-Describing Components ................................................................15

Cross-Language Interoperability ..........................................................16

The Catch..........................................................................................17

Security ..................................................................................................17

Code Access Security (CAS)............................................................18

Role-Based Security ........................................................................18

Summary ................................................................................................18

2Y OUR F IRST VB.NET A PPLICATION 21

The Start Page........................................................................................21

Creating a New Project ..........................................................................23

Examining the IDE ..........................................................................25

Creating Your First VB.NET Application..............................................31

Windows Application Enhancements ....................................................36

Resizing Controls Automatically......................................................36

Anchoring Controls to the Form Edges ..........................................38

Easier Menus ....................................................................................41

Setting Tab Order ............................................................................42

Line and Shape Controls: You’re Outta Here ..................................44

Form Opacity....................................................................................45

Summary ................................................................................................48

3M AJOR VB.NET C HANGES 49

General Changes ....................................................................................49

Default Properties ............................................................................49

Subs and Functions Require Parentheses ........................................50

Changes to Boolean Operators ........................................................51

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