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The document is a user manual for PanelView Plus terminals that provides important safety and operational information. It covers key topics such as hazardous location installation, environmental requirements, installation procedures, power connections, accessing configuration mode, and loading and running applications. The manual instructs technicians on how to properly install, configure, and operate the PanelView Plus terminals. It also provides revision details and references additional resources for further information.
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This document provides an introduction to eHealth Service Availability, which is a plug-in module for the eHealth SystemEDGE agent that monitors the response time and availability of critical network services and Internet applications. It can monitor services on a single system or across multiple systems. The SystemEDGE agent provides configuration and reporting for Service Availability through SNMP. Service Availability stores test information in the Service Availability table and the svcrsp.cf configuration file. Tests can be created manually or using the svcwatch utility, SystemEDGE, or AdvantEDGE View.
The document is a user manual for PanelView Plus terminals that provides important safety and operational information. It covers key topics such as hazardous location installation, environmental requirements, installation procedures, power connections, accessing configuration mode, and loading and running applications. The manual instructs technicians on how to properly install, configure, and operate the PanelView Plus terminals. It also provides revision details and references additional resources for further information.
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This document provides an instructor guide for the Oracle Developer: Build Forms I course, outlining the course objectives and content which teaches students how to use Oracle Forms Builder to create basic forms and applications. The guide includes 23 lessons on topics such as creating forms, working with items and triggers, and debugging and testing forms. It also contains appendices with additional reference material.
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As of 5/14/25, the Southwestern outbreak has 860 cases, including confirmed and pending cases across Texas, New Mexico, Oklahoma, and Kansas. Experts warn this is likely a severe undercount. The situation remains fluid, with case numbers expected to rise. Experts project the outbreak could last up to a year.
CURRENT CASE COUNT: 860 (As of 5/14/2025)
Texas: 718 (+6) (62% of cases are in Gaines County)
New Mexico: 71 (92.4% of cases are from Lea County)
Oklahoma: 17
Kansas: 54 (+6) (38.89% of the cases are from Gray County)
HOSPITALIZATIONS: 102 (+2)
Texas: 93 (+1) - This accounts for 13% of all cases in Texas.
New Mexico: 7 – This accounts for 9.86% of all cases in New Mexico.
Kansas: 2 (+1) - This accounts for 3.7% of all cases in Kansas.
DEATHS: 3
Texas: 2 – This is 0.28% of all cases
New Mexico: 1 – This is 1.41% of all cases
US NATIONAL CASE COUNT: 1,033 (Confirmed and suspected)
INTERNATIONAL SPREAD (As of 5/14/2025)
Mexico: 1,220 (+155)
Chihuahua, Mexico: 1,192 (+151) cases, 1 fatality
Canada: 1,960 (+93) (Includes Ontario’s outbreak, which began November 2024)
Ontario, Canada – 1,440 cases, 101 hospitalizations
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5. Visual Basic 2008 Programmer s Reference Rod Stephens
Digital Instant Download
Author(s): Rod Stephens
ISBN(s): 9780470281796, 0470281790
Edition: Original
File Details: PDF, 15.69 MB
Year: 2008
Language: english
13. About the Author
Rod Stephens started out as a mathematician, but while studying at MIT, discovered the joys of
programming and has been programming professionally ever since. During his career, he has worked on
an eclectic assortment of applications in such fields as telephone switching, billing, repair dispatching,
tax processing, wastewater treatment, concert ticket sales, cartography, and training for professional
football players.
Rod is a Microsoft Visual Basic Most Valuable Professional (MVP) and ITT adjunct instructor. He has
written 18 books that have been translated into half a dozen different languages, and more than 200
magazine articles covering Visual Basic, Visual Basic for Applications, Delphi, and Java. He is currently a
regular contributor to DevX (www.DevX.com).
Rod’s popular VB Helper web site www.vb-helper.com receives several million hits per month and
contains thousands of pages of tips, tricks, and example code for Visual Basic programmers, as well as
example code for this book.
Credits
Executive Editor
Robert Elliott
Development Editor
Christopher J. Rivera
Technical Editor
John Mueller
Production Editor
Angela Smith
Copy Editor
Kim Cofer
Editorial Manager
Mary Beth Wakefield
Production Manager
Tim Tate
Vice President and Executive Group Publisher
Richard Swadley
Vice President and Executive Publisher
Joseph B. Wikert
Project Coordinator, Cover
Lynsey Stanford
Proofreader
Nancy Hanger, Windhaven
Indexer
J & J Indexing
ffirs.indd v
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14. Acknowledgments
Thanks to Bob Elliott, Christopher Rivera, Angela Smith, and all of the others who work so hard to make
producing any book possible.
Thanks also to technical editor John Mueller for adding extra depth and perspective to the book. Visit
www.mwt.net/~jmueller to learn about John’s books and to sign up for his free newsletter .NET Tips,
Trends & Technology eXTRA.
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15. Contents
Acknowledgments vi
Introduction xxvii
Part I: IDE 1
Chapter 1: Introduction to the IDE 3
Different IDE Appearance 4
IDE Configurations 5
Projects and Solutions 6
Starting the IDE 7
Creating a Project 9
Saving a Project 12
Summary 13
Chapter 2: Menus, Toolbars, and Windows 15
Menus 15
File 16
Edit 18
View 20
Project 21
Build 26
Debug 28
Data 28
Format 28
Tools 29
Test 33
Window 34
Community 35
Help 35
Toolbars 35
Secondary Windows 36
Toolbox 37
Properties Window 38
Summary 41
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16. Contents
viii
Chapter 3: Customization 43
Adding Commands 43
Removing Commands 45
Modifying Commands 45
Making Keyboard Shortcuts 47
Summary 48
Chapter 4: Windows Form Designer 49
Setting Designer Options 49
Adding Controls 51
Selecting Controls 51
Copying Controls 53
Moving and Sizing Controls 54
Arranging Controls 54
Setting Properties 54
Setting Group Properties 55
Setting Properties for Several Controls 55
Using Smart Tags 56
Using Command Verbs 56
Adding Code to Controls 57
Summary 59
Chapter 5: WPF Designer 61
Early Version Warning 61
Recognizing Designer Windows 63
Adding Controls 64
Selecting Controls 64
Copying Controls 65
Moving and Sizing Controls 66
Setting Properties 67
Setting Group Properties 68
Adding Code to Controls 68
Summary 69
Chapter 6: Visual Basic Code Editor 71
Margin Icons 72
Outlining 74
Tooltips 75
IntelliSense 77
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17. Contents
ix
Code Coloring and Highlighting 79
Code Snippets 81
Using Snippets 82
Creating Snippets 83
The Code Editor at Runtime 85
Summary 86
Chapter 7: Debugging 87
The Debug Menu 87
The Debug Windows Submenu 91
The Breakpoints Window 95
The Command and Immediate Windows 97
Summary 99
Part II: Getting Started 101
Chapter 8: Selecting Windows Forms Controls 103
Controls Overview 103
Choosing Controls 109
Containing and Arranging Controls 109
Making Selections 111
Entering Data 113
Displaying Data 113
Providing Feedback 114
Initiating Action 115
Displaying Graphics 116
Displaying Dialog Boxes 117
Supporting Other Controls 117
Third-Party Controls 118
Summary 119
Chapter 9: Using Windows Forms Controls 121
Controls and Components 121
Creating Controls 123
Creating Controls at Design Time 123
Adding Controls to Containers 124
Creating Controls at Runtime 124
Properties 126
Properties at Design Time 127
Properties at Runtime 132
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18. Contents
x
Useful Control Properties 133
Position and Size Properties 137
Methods 138
Events 139
Creating Event Handlers at Design Time 139
WithEvents Event Handlers 141
Setting Event Handlers at Runtime 141
Control Array Events 142
Validation Events 143
Summary 147
Chapter 10: Windows Forms 149
Transparency 150
About, Splash, and Login Forms 153
Mouse Cursors 154
Icons 156
Application Icons 157
Notification Icons 157
Properties Adopted by Child Controls 158
Property Reset Methods 159
Overriding WndProc 159
SDI and MDI 161
MDI Features 162
MDI Events 165
MDI versus SDI 167
MRU Lists 168
Dialog Boxes 170
Wizards 172
Summary 173
Chapter 11: Selecting WPF Controls 175
Controls Overview 176
Containing and Arranging Controls 176
Making Selections 179
Entering Data 180
Displaying Data 180
Providing Feedback 181
Initiating Action 182
Presenting Graphics and Media 182
Providing Navigation 184
Managing Documents 184
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19. Contents
xi
Digital Ink 184
Summary 185
Chapter 12: Using WPF Controls 187
WPF Concepts 187
Separation of User Interface and Code 188
WPF Control Hierarchies 189
WPF in the IDE 190
Editing XAML 190
Editing Visual Basic Code 194
XAML Features 197
Objects 197
Resources 199
Styles 201
Templates 202
Transformations 205
Animations 206
Drawing Objects 208
Procedural WPF 213
Documents 218
Flow Documents 218
Fixed Documents 221
XPS Documents 221
Summary 222
Chapter 13: WPF Windows 223
Window Applications 223
Page Applications 225
Browser Applications 226
Frame Applications 227
PageFunction Applications 229
Wizard Applications 231
Summary 235
Chapter 14: Program and Module Structure 237
Hidden Files 237
Code File Structure 242
Code Regions 243
Conditional Compilation 243
Namespaces 252
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20. Contents
xii
Typographic Code Elements 253
Comments 253
XML Comments 254
Line Continuation 258
Line Joining 259
Line Labels 259
Summary 260
Chapter 15: Data Types, Variables, and Constants 261
Data Types 262
Type Characters 264
Data Type Conversion 266
Narrowing Conversions 267
Data Type Parsing Methods 269
Widening Conversions 269
Variable Declarations 270
Attribute_List 270
Accessibility 271
Shared 272
Shadows 272
ReadOnly 274
Dim 275
WithEvents 276
Name 278
Bounds_List 279
New 280
As Type and Inferred Types 280
Initialization_Expression 281
Multiple Variable Declarations 285
Option Explicit and Option Strict 286
Scope 288
Block Scope 288
Procedure Scope 290
Module Scope 290
Namespace Scope 291
Restricting Scope 291
Parameter Declarations 292
Property Procedures 294
Enumerated Data Types 295
Anonymous Types 298
Nullable Types 299
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22. Contents
xiv
Chapter 18: Program Control Statements 353
Decision Statements 353
Single Line If Then 353
Multiline If Then 355
Select Case 355
Enumerated Values 358
IIf 359
If 360
Choose 360
Looping Statements 362
For Next 362
Non-integer For Next Loops 364
For Each 365
Enumerators 367
Iterators 369
Do Loop Statements 369
While End 371
Exit and Continue 371
GoTo 372
Summary 375
Chapter 19: Error Handling 377
Bugs versus Unplanned Conditions 377
Catching Bugs 378
Catching Unexpected Conditions 380
Global Exception Handling 382
Structured Error Handling 383
Exception Objects 385
StackTrace Objects 386
Throwing Exceptions 387
Custom Exceptions 389
Visual Basic Classic Error Handling 391
On Error GoTo Line 391
On Error Resume Next 392
On Error GoTo 0 393
On Error GoTo ⫺1 394
Error-Handling Mode 395
Structured versus Classic Error Handling 396
The Err Object 397
Debugging 398
Summary 399
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23. Contents
xv
Chapter 20: Database Controls and Objects 401
Automatically Connecting to Data 401
Connecting to the Data Source 402
Adding Data Controls to the Form 406
Automatically Created Objects 410
Other Data Objects 412
Data Overview 413
Connection Objects 414
Transaction Objects 417
Data Adapters 419
Command Objects 424
DataSet 426
DataTable 430
DataRow 433
DataColumn 435
DataRelation 437
Constraints 440
DataView 442
DataRowView 445
Simple Data Binding 446
CurrencyManager 448
Complex Data Binding 451
Summary 455
Chapter 21: LINQ 457
Introduction to LINQ 458
Basic LINQ Query Syntax 460
From 460
Where 461
Order By 462
Select 462
Using LINQ Results 465
Advanced LINQ Query Syntax 466
Join 466
Group By 467
Aggregate Functions 470
Set Operations 471
Limiting Results 471
LINQ Functions 472
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xvi
LINQ Extension Methods 474
Method-Based Queries 474
Method-Based Queries with Lambda Functions 476
Extending LINQ 477
LINQ to Objects 480
LINQ to XML 481
XML Literals 481
LINQ Into XML 482
LINQ Out Of XML 484
LINQ to ADO.NET 487
LINQ to SQL and LINQ to Entities 487
LINQ to DataSet 488
Summary 491
Chapter 22: Custom Controls 493
Custom Controls in General 494
Creating the Control Project 494
Setting the Toolbox Icon 495
Testing in the UserControl Test Container 495
Making a Test Project 496
Test the Control 498
Implement Properties, Methods, and Events 498
Assign Attributes 499
Manage Design Time and Runtime 501
Derived Controls 502
Shadowing Parent Features 504
Hiding Parent Features 505
Composite Controls 506
Controls Built from Scratch 508
Components 509
Invisible Controls 510
Picking a Control Class 511
Controls and Components in Executable Projects 512
UserControls in Executable Projects 512
Inherited UserControls in Executable Projects 512
Controls in Executable Projects 513
Inherited Controls in Executable Projects 513
Components in Executable Projects 514
Custom Component Security 514
Strongly Named Assemblies 514
Using a Signature Authority 516
Summary 517
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Chapter 23: Drag and Drop, and the Clipboard 519
Drag-and-Drop Events 520
A Simple Example 521
Learning Data Types Available 523
Dragging Within an Application 524
Accepting Dropped Files 525
Dragging Objects 526
Changing Format Names 528
Dragging Multiple Data Formats 529
Using the Clipboard 532
Summary 535
Chapter 24: UAC Security 537
UAC Overview 537
Designing for UAC 538
Elevating Programs 542
User 542
Calling Program 542
Called Program 543
Summary 544
Part III: Object-Oriented Programming 545
Chapter 25: OOP Concepts 547
Classes 547
Encapsulation 549
Inheritance 550
Inheritance Hierarchies 552
Refinement and Abstraction 552
“Has-a” and “Is-a” Relationships 554
Adding and Modifying Class Features 555
Interface Inheritance 557
Polymorphism 558
Overloading 559
Extension Methods 560
Summary 561
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Chapter 26: Classes and Structures 563
Classes 563
Attribute_list 564
Partial 564
Accessibility 565
Shadows 566
Inheritance 567
Of type_list 568
Inherits parent_class 569
Implements interface 570
Structures 573
Structures Cannot Inherit 574
Structures Are Value Types 574
Memory Required 575
Heap and Stack Performance 577
Object Assignment 577
Parameter Passing 578
Boxing and Unboxing 580
Class Instantiation Details 580
Structure Instantiation Details 582
Garbage Collection 584
Finalize 585
Dispose 587
Constants, Properties, and Methods 589
Events 591
Declaring Events 591
Raising Events 593
Catching Events 593
Declaring Custom Events 595
Shared Variables 599
Shared Methods 600
Summary 602
Chapter 27: Namespaces 605
The Imports Statement 606
Automatic Imports 607
Namespace Aliases 609
Namespace Elements 610
The Root Namespace 610
Making Namespaces 611
Classes, Structures, and Modules 613
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Resolving Namespaces 614
Summary 617
Chapter 28: Collection Classes 619
What Is a Collection? 619
Arrays 620
Array Dimensions 621
Lower Bounds 622
Resizing 623
Speed 623
Other Array Class Features 624
Collections 627
ArrayList 627
StringCollection 629
Strongly Typed Collections 629
Read-Only Strongly Typed Collections 631
NameValueCollection 632
Dictionaries 633
ListDictionary 634
Hashtable 635
HybridDictionary 636
Strongly Typed Dictionaries 636
Other Strongly Typed Derived Classes 638
StringDictionary 639
SortedList 639
CollectionsUtil 639
Stacks and Queues 640
Stack 640
Queue 641
Generics 643
Summary 645
Chapter 29: Generics 647
Advantages of Generics 647
Defining Generics 648
Generic Constructors 650
Multiple Types 650
Constrained Types 652
Using Generics 654
Imports Aliases 655
Derived Classes 655
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35. Introduction
It has been said the Sir Isaac Newton was the last person to know everything. He was an accomplished
physicist (his three laws of motion were the basis of classical mechanics, which defined astrophysics for
three centuries), mathematician (he was one of the inventors of calculus and developed Newton’s
Method for finding roots of equations), astronomer, natural philosopher, and alchemist. He invented the
reflecting telescope, a theory of color, a law of cooling, and studied the speed of sound.
Just as important, he was born before relativity, quantum mechanics, gene sequencing, thermodynamics,
parallel computation, and a swarm of other extremely difficult branches of science.
If you ever used Visual Basic 3, you too could have known everything. Visual Basic 3 was a reasonably
small but powerful language. Visual Basic 4 added classes to the language and made Visual Basic much
more complicated. Versions 4, 5, and 6 added more support for database programming and other topics
such as custom controls, but Visual Basic was still a fairly understandable language, and if you took the
time you could become an expert in just about all of it.
Visual Basic .NET accelerated the expansion of Visual Basic tremendously. The .NET Framework added
powerful new tools to Visual Basic, but those tools came at the cost of increased complexity. Associated
technologies have been added to the language at an ever-increasing rate, so, today, it is impossible for
anyone to be an expert on every topic that deals with Visual Basic.
To cover every nook and cranny in Visual Basic you would need an in-depth understanding of database
technologies, custom controls, custom property editors, XML, cryptography, serialization, two- and
three-dimensional graphics, multi-threading, reflection, the code document object model (DOM), diagnostics,
globalization, Web Services, inter-process communication, work flow, Office, ASP, and much more.
This book doesn’t even attempt to cover all of these topics. Instead, it provides a broad, solid
understanding of essential Visual Basic topics. It explains the powerful development environment that
makes Visual Basic such a productive language. It describes the Visual Basic language itself and explains
how to use it to perform a host of important development tasks.
It also explains the forms, controls, and other objects that Visual Basic provides for building applications
in a modern windowing environment.
This book may not cover every possible topic related to Visual Basic, but it does cover the majority of the
technologies that developers need to build sophisticated applications.
Should You Use Visual Basic 2008?
Software engineers talk about five generations of languages (so far). A first-generation language (1GL) is
machine language: 0s and 1s.
A second-generation language (2GL) is an assembly language that provides terse mnemonics for
machine instructions. It provides few additional tools beyond an easier way to write machine code.
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Third-generation languages (3GLs) are higher-level languages such as Pascal and FORTRAN. They
provide much more sophisticated language elements such as subroutines, loops, and data structures.
Fourth-generation languages (4GLs) are “natural languages” such as SQL. They let developers use a
language that is sort of similar to a human language to execute programming tasks. For example, the
SQL statement “SELECT * FROM Customers WHERE Balance>50” tells the database to return
information about customers that owe more than $50.
Fifth-generation languages (5GLs) provide powerful, highly graphical development environments to
allow developers to use the underlying language in more sophisticated ways. The Visual Studio
development environment is extremely powerful. It provides graphical editors to make building forms
and editing properties easy and intuitive; IntelliSense to help developers remember what to type next;
auto-completion so developers can use meaningful variable names without needing to waste time typing
them completely by hand; and breakpoints, watches, and other advanced debugging tools that make
building applications easier.
Visual Basic uses one of the most powerful development environments ever built, Visual Studio, but it is
not the only language that does so. The C# language also uses the Visual Studio development
environment. So the question is, should you use Visual Basic or C#?
A Visual Basic programmer’s joke asks, “What’s the difference between Visual Basic .NET and C#?
About three months!” The implication is that Visual Basic .NET syntax is easier to understand, and
building applications with it is faster. Similarly, C# programmers have their jokes about Visual Basic
.NET, implying that C# is more powerful.
In fact, Visual Basic .NET is not a whole lot easier to use than C#, and C# is not significantly more
powerful. The basic form of the two languages is very similar. Aside from a few stylistic differences
(Visual Basic is line-oriented; C# uses lots of braces and semicolons), the languages are comparable. Both
use the Visual Studio development environment, both provide access to the .NET Framework of support
classes and tools, and both provide similar syntax for performing basic programming tasks.
The main difference between these languages is one of style. If you have experience with previous
versions of Visual Basic, you will probably find Visual Basic 2008 easier to get used to. If you have
experience with C++ or Java, you will probably find C# (or Visual C++ or Visual J#) easy to learn.
Visual Basic does have some ties with other Microsoft products. For example, Active Server Pages (ASP)
uses Visual Basic to create interactive web pages. Microsoft Office applications (Word, Excel, PowerPoint,
and so forth) and many third-party tools use Visual Basic for Applications (VBA) as a macro
programming language. If you know Visual Basic, you have a big head start in using these other
languages. ASP and VBA are based on pre-.NET versions of Visual Basic, so you won’t instantly know
how to use them, but you’ll have an advantage if you need to learn ASP or VBA.
If you are new to programming, either Visual Basic 2008 or C# is a good choice. I think Visual Basic 2008
may be a little easier to learn, but I may be slightly biased because I’ve been using Visual Basic since long
before C# was invented. You won’t be making a big mistake either way, and you can easily switch later,
if necessary.
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Who Should Read This Book
This book is intended for programmers of all levels. It describes the Visual Basic 2008 language from
scratch, so you don’t need experience with previous versions of the language. The book also covers
many intermediate and advanced topics. It covers topics in enough depth that even experienced
developers will discover new tips, tricks, and language details. After you have mastered the language,
you may still find useful tidbits throughout the book, and the reference appendixes will help you look
up easily forgotten details.
The chapters move quickly through the more introductory material. If you have never programmed
before and are intimidated by computers, you might want to read a more introductory book first. If you
are a beginner who’s not afraid of the computer, you should have few problems learning Visual Basic
2008 from this book.
If you have programmed in any other language, fundamentals such as variable declarations, data types,
and arrays should be familiar to you, so you should have no problem with this book. The index and
reference appendices should be particularly useful in helping you translate from the languages you
already know into the corresponding Visual Basic syntax.
How This Book Is Organized
The chapters in this book are divided into five parts plus appendixes. The chapters in each part are
described here. If you are an experienced programmer, you can use these descriptions to decide which
chapters to skim and which to read in detail.
Part I: IDE
The chapters in this part of the book describe the Visual Studio integrated development environment
(IDE) from a Visual Basic developer’s point of view. The IDE is mostly the same for C# and other
developers but there are a few differences such as which keyboard shortcuts perform which tasks.
Chapter 1, “Introduction to the IDE,” explains how to get started using the Visual Studio integrated
development environment. It tells how to configure the IDE for different kinds of development. It
defines and describes Visual Basic projects and solutions, and shows how to create, run, and save a
new project.
Chapter 2, “Menus, Toolbars, and Windows,” describes the most useful and important commands
available in the IDE’s menus and toolbars. The IDE’s menus and toolbars include hundreds of
commands, so this chapter covers only those that are the most useful.
Chapter 3, “Customization,” explains how to customize the IDE. It tells how you can create, hide, and
rearrange menus and toolbars to make it easy to use the tools that you find most useful.
Chapter 4, “Windows Forms Designer,” describes the designer that you can use to build Windows
Forms. It explains how to create, size, move, and copy controls. It tells how to set control properties and
add code to respond to control events. It also explains how to use handy designer tools such as smart
tags and command verbs.
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Chapter 5, “WPF Designer,” explains how to use the Windows Presentation Foundation (WPF) form
designer. This chapter is similar to Chapter 4 except that it covers WPF forms instead of Windows Forms.
Chapter 6, “Visual Basic Code Editor,” describes one of the most important windows used by
developers: the code editor. It explains how to write code, set breakpoints, use code snippets, and get the
most out of IntelliSense.
Chapter 7, “Debugging,” explains debugging tools provided by Visual Studio. It describes the
debugging windows and explains such techniques as setting complex breakpoints to locate bugs.
Part II: Getting Started
The chapters in this part of the book explain the bulk of the Visual Basic language and the objects that
support it. They explain the forms, controls, and other objects that a program uses to build a user
interface, and they tell how you can put code behind those objects to implement the program’s
functionality.
Chapter 8, “Selecting Windows Forms Controls,” provides an overview of the Windows Forms controls
that you can put on a form. It groups the controls by category to help you find the controls you can use
for a particular purpose.
Chapter 9, “Using Windows Forms Controls,” gives more detail about how you can use Windows Forms
controls. It explains how you can build controls at design time or runtime, how to set complex property
values, and how to use useful properties that are common to many different kinds of controls. It explains
how to add event handlers to process control events and how to validate user-entered data.
Chapter 10, “Windows Forms,” describes the forms you use in a Windows Forms application. Forms are
just another kind of control, but their unique position in the application’s architecture means they have
some special properties, and this chapter describes them.
Chapter 11, “Selecting WPF Controls,” provides an overview of WPF controls. It groups the controls by
category to help you find the controls you can use for a particular purpose. This chapter is similar to
Chapter 8 except that it covers WPF controls instead of Windows Forms controls.
Chapter 12, “Using WPF Controls,” gives more detail about how you can use WPF controls. This chapter
is similar to Chapter 9 except that it deals with WPF controls instead of Windows Forms controls.
Chapter 13, “WPF Windows,” describes the windows that WPF applications use in place of Windows
Forms. This chapter is similar to Chapter 10 except that it deals with WPF controls instead of Windows
Forms controls.
Chapter 14, “Program and Module Structure,” describes the most important files that make up a Visual
Basic project. It describes some of the hidden files that projects contain and explains some of the
structure that you can give to code within a module such as code regions and conditionally compiled
code.
Chapter 15, “Data Types, Variables, and Constants,” explains the standard data types provided by Visual
Basic. It shows how to declare and initialize variables and constants, and explains variable scope.
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It discusses value and reference types, passing parameters by value or reference, and creating parameter
variables on the fly. It also explains how to create arrays, enumerated types, and structures.
Chapter 16, “Operators,” describes the operators a program uses to perform calculations. These include
mathematical operators (+, *, ), string operators (&), and Boolean operators (And, Or). The chapter
explains operator precedence and type conversion issues that arise when an expression combines more
than one type of operator (for example, arithmetic and Boolean).
Chapter 17, “Subroutines and Functions,” explains how you can use subroutines and functions to break
a program into manageable pieces. It describes routine overloading and scope. It also describes lambda
functions and relaxed delegates, two features that are new in Visual Basic 2008.
Chapter 18, “Program Control Statements,” describes the statements that a Visual Basic program uses to
control code execution. These include decision statements (If Then Else, Select Case, IIF, Choose)
and looping statements (For Next, For Each, Do While, While Do, Repeat Until).
Chapter 19, “Error Handling,” explains error handling and debugging techniques. It describes the Try
Catch structured error handler, in addition to the older On Error statement inherited from earlier
versions of Visual Basic. It discusses typical actions a program might take when it catches an error. It also
describes techniques for preventing errors and making errors more obvious when they do occur.
Chapter 20, “Database Controls and Objects,” explains how to use the standard Visual Basic database
controls. These include database connection components that handle connections to a database, DataSet
components that hold data within an application, and data adapter controls that move data between
data connections and DataSets.
Chapter 21, “LINQ,” describes language integrated query (LINQ) features. It explains how you can write
SQL-like queries to select data from or into objects, XML, or database objects. LINQ is a new feature in
Visual Basic 2008.
Chapter 22, “Custom Controls,” explains how to build your own customized controls that you can then
use in other applications. It covers the three main methods for creating a custom control: derivation,
composition, and building from scratch. This chapter also provides several examples that you can use as
a starting point for controls of your own.
Chapter 23, “Drag and Drop, and the Clipboard,” explains how a Visual Basic program can support
drag-and-drop operations. It tells how your program can start a drag to another application, how to
respond to drag operations started by another application, and how to receive a drop from another
application. This chapter also explains how a program can copy data to and from the clipboard. Using
the clipboard is similar to certain types of drag-and-drop operations, so these topics fit naturally in
one chapter.
Chapter 24, “UAC Security,” describes the User Access security model used by the Vista operating
system. With UAC security, all users run with reduced “normal” user privileges. If a program must
perform tasks requiring administrator permissions, a UAC dialog box allows you to elevate the
application’s privilege level. This chapter describes UAC security and explains how you can mark a
program for privilege elevation.
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Part III: Object-Oriented Programming
This part explains fundamental concepts in object-oriented programming (OOP) with Visual Basic. It
also describes some of the more important classes and objects that you can use when building an
application.
Chapter 25, “OOP Concepts,” explains the fundamental ideas behind object-oriented programming
(OOP). It describes the three main features of OOP: encapsulation, polymorphism, and inheritance. It
explains the benefits of these features, and tells how you can take advantage of them in Visual Basic.
Chapter 26, “Classes and Structures,” explains how to declare and use classes and structures. It explains
what classes and structures are, and it describes their differences. It shows the basic declaration syntax
and tells how to create instances of classes and structures. It also explains some of the trickier class issues
(such as private class scope, declaring events, and shared variables and methods).
Chapter 27, “Namespaces,” explains namespaces. It discusses how Visual Studio uses namespaces to
categorize code and to prevent name collisions. It describes a project’s root namespace, tells how Visual
Basic uses namespaces to resolve names (such as function and class names), and demonstrates how you
can add namespaces to an application yourself.
Chapter 28, “Collection Classes,” explains classes included in Visual Studio that you can use to hold
groups of objects. It describes the various collection, dictionary, queue, and stack classes; tells how to
make strongly typed versions of those classes; and gives some guidance on deciding which class to use
under different circumstances.
Chapter 29, “Generics,” explains templates that you can use to build new classes designed to work with
specific data types. For example, you can build a generic binary tree, and then later use it to build classes
to represent binary trees of customer orders, employees, or work items.
Part IV: Graphics
The chapters in this part of the book describe graphics in Visual Basic 2008. They explain the Graphics
Device Interface+ (GDI+) routines that programs use to draw images in Visual Basic. They explain how
to draw lines and text; how to draw and fill circles and other shapes; and how to load, manipulate, and
save bitmap images. This part also explains how to generate printed output and how to send reports to
the screen or to the printer.
Chapter 30, “Drawing Basics,” explains the fundamentals of drawing graphics in Visual Basic 2008. It
describes the graphics namespaces and the classes they contain. It describes the most important of these
classes, Graphics, in detail. It also describes the Paint event handler and other events that a program
should use to keep its graphics up to date.
Chapter 31, “Brushes, Pens, and Paths,” explains the most important graphics classes after Graphics:
Pen and Brush. It tells how you can use Pens to draw solid lines, dashed lines, lines with custom dash
patterns, and lines with custom lengthwise stripe patterns. It tells how to use Brushes to fill areas with
colors, hatch patterns, linear color gradients, color gradients that follow a path, and tiled images. This
chapter also describes the GraphicsPath class, which represents a series of lines, shapes, curves,
and text.
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Chapter 32, “Text,” explains how to draw strings of text. It shows how to create different kinds of fonts,
determine exactly how big text will be when drawn in a particular font, and use GDI+ functions to make
positioning text simple. It shows how to use a StringFormat object to determine how text is aligned,
wrapped, and trimmed, and how to read and define tab stops.
Chapter 33, “Image Processing,” explains how to load, modify, and save image files. It shows how to
read and write the pixels in an image, and how to save the result in different file formats such as BMP,
GIF, and JPEG. It tells how to use images to provide auto-redraw features, and how to manipulate an
image pixel by pixel, both using a Bitmap’s GetPixel and SetPixel methods and using “unsafe”
access techniques that make pixel manipulation much faster than is possible with normal GDI+ methods.
Chapter 34, “Printing,” explains different ways that a program can send output to the printer. It shows
how you can use the PrintDocument object to generate printout data. You can then use the
PrintDocument to print the data immediately, use a PrintDialog control to let the user select the
printer and set its characteristics, or use a PrintPreviewDialog control to let the user preview
the results before printing.
Chapter 35, “Reporting,” provides an introduction to Crystal Reports, a tool that makes generating
reports in Visual Basic relatively easy. The chapter explains the basics of Crystal Reports and steps
through an example that builds a simple report.
Part V: Interacting with the Environment
The chapters in this part of the book explain how an application can interact with its environment. They
show how the program can save and load data in external sources (such as the System Registry, resource
files, and text files); work with the computer’s screen, keyboard, and mouse; and interact with the user
through standard dialog controls.
Chapter 36, “Configuration and Resources,” describes some of the ways that a Visual Basic program can
store configuration and resource values for use at runtime. Some of the most useful of these include
environment variables, the Registry, configuration files, and resource files.
Chapter 37, “Streams,” explains the classes that a Visual Basic application can use to work with stream
data. Some of these classes are FileStream, MemoryStream, BufferedStream, TextReader,
and TextWriter.
Chapter 38, “File-System Objects,” describes classes that let a Visual Basic application interact with the
file system. These include classes such as Directory, DirectoryInfo, File, and FileInfo that make
it easy to create, examine, move, rename, and delete directories and files.
Chapter 39, “Windows Communication Foundation,” describes the Windows Communication
Foundation (WCF), a library and set of tools that make building service-oriented applications easier. This
chapter explains how to use new WCF attributes to easily define a service, how to use configuration files
to configure the service, and how to use WCF tools to consume the service.
Chapter 40, “Useful Namespaces,” describes some of the more useful namespaces defined by the .NET
Framework. It provides a brief overview of some of the most important System namespaces and gives
more detailed examples that demonstrate regular expressions, XML, cryptography, reflection, threading,
and Direct3D.
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Part VI: Appendixes
The book’s appendixes provide a categorized reference of the Visual Basic 2008 language. You can use
them to quickly review the syntax of a particular command, select from among several overloaded
versions of a routine, or refresh your memory of what a particular class can do. The chapters earlier in
the book give more context, explaining how to perform specific tasks and why one approach might be
preferred over another.
Appendix A, “Useful Control Properties, Methods, and Events,” describes properties, methods, and
events that are useful with many different kinds of controls.
Appendix B, “Variable Declarations and Data Types,” summarizes the syntax for declaring variables. It
also gives the sizes and ranges of allowed values for the fundamental data types.
Appendix C, “Operators,” summarizes the standard operators such as +, <<, OrElse, and Like. It also
gives the syntax for operator overloading.
Appendix D, “Subroutine and Function Declarations,” summarizes the syntax for subroutine, function,
and property procedure declarations.
Appendix E, “Control Statements,” summarizes statements that control program flow, such as If Then,
Select Case, and looping statements.
Appendix F, “Error Handling,” summarizes both structured and “classic” error handling. It describes
some useful exception classes and gives an example showing how to build a custom exception class.
Appendix G, “Windows Forms Controls and Components,” describes standard Windows Forms controls
and components provided by Visual Basic 2008. It explains the properties, methods, and events that I
have found most useful when working with these components.
Appendix H, “WPF Controls,” describes the controls that are placed in the Toolbox by default when you
build WPF applications. This is a relatively brief list to give you a feel for the kinds of controls that are
available, rather than an in-depth description like the one provided for the standard Windows Forms
controls in Appendix G.
Appendix I, “Visual Basic Power Packs,” lists some additional tools that you can download to make
Visual Basic development easier. This appendix describes some Visual Basic 6 compatibility tools
provided by Microsoft, and some GotDotNet Power Packs that contain useful controls built in Visual
Basic 2003.
Appendix J, “Form Objects,” describes forms. In a very real sense, forms are just another type of
component. They play such a key role in Visual Basic applications, however, that they deserve special
attention in their own appendix.
Appendix K, “Classes and Structures,” summarizes the syntax for declaring classes and structures, and
defining their constructors and events.
Appendix L, “LINQ,” summarizes LINQ syntax.
Appendix M, “Generics,” summarizes the syntax for declaring generic classes.
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Appendix N, “Graphics,” summarizes the objects used to generate graphics in Visual Basic 2008.
It covers the most useful graphics namespaces.
Appendix O, “Useful Exception Classes,” lists some of the more useful exception classes defined by
Visual Basic. You may want to throw these exceptions in your own code.
Appendix P, “Date and Time Format Specifiers,” summarizes specifier characters that you can use to
format dates and times. For example, they let you display a time using a 12-hour or 24-hour clock.
Appendix Q, “Other Format Specifiers,” summarizes formatting for numbers and enumerated types.
Appendix R, “The Application Class,” summarizes the Application class that provides properties and
methods for controlling the current application.
Appendix S, “The My Namespace,” describes the My namespace, which provides shortcuts to useful
features scattered around other parts of the .NET Framework. It provides shortcuts for working with the
application, computer hardware, application forms, resources, and the current user.
Appendix T, “Streams,” summarizes the Visual Basic stream classes such as Stream, FileStream,
MemoryStream, TextReader, CryptoStream, and so forth.
Appendix U, “File-System Classes,” summarizes methods that an application can use to learn about and
manipulate the file system. It explains classic Visual Basic methods such as FreeFile, WriteLine, and
ChDir, as well as newer .NET Framework classes such as FileSystem, Directory, and File.
Appendix V, “Index of Examples,” briefly describes the 435 example programs that are available for
download on the book’s web site. You can use this list to see which programs demonstrate particular
techniques.
How to Use This Book
If you are an experienced Visual Basic .NET programmer, you may want to skim the language basics
covered in the first parts of the book. You may find a few new features that have appeared in Visual
Basic 2008, so you probably shouldn’t skip these chapters entirely, but most of the basic language
features are the same as in previous versions.
Intermediate programmers and those with less experience with Visual Basic .NET should take these
chapters a bit more slowly. The chapters in Part III, “Object-Oriented Programming,” cover particularly
tricky topics. Learning all the variations on inheritance and interfaces can be rather confusing.
Beginners should spend more time on these first chapters because they set the stage for the material that
follows. It will be a lot easier for you to follow a discussion of file management or regular expressions if
you are not confused by the error-handling code that the examples take for granted.
Programming is a skill best learned by doing. You can pick up the book and read through it quickly if
you like, but the information is more likely to stick if you open the development environment and
experiment with some programs of your own.
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Normally, when I read a new programming book, I work through every example myself, modifying the
code to see what happens if I try different things not covered by the author. I experiment with new
variations and pay particular attention to errors, which are hard to cover completely in a book. It’s one
thing to read about strongly typed collections; it’s another to build one yourself using data that is
meaningful to you.
Learning by doing may encourage you to skip sections of the book. For example, Chapter 1 covers the
IDE in detail. After you’ve read for a while, you may want to skip some sections and start experimenting
with the environment on your own. I encourage you to do so. Lessons learned by doing stick better than
those learned by reading. Later, when you have some experience with the development environment,
you can go back and examine Chapter 1 in more detail to see if you missed anything during your
experimentation.
The final part of the book is a Visual Basic 2008 reference. These appendixes present more concise,
categorized information about the language. You can use these appendixes to recall the details of specific
operations. For example, you can read Chapter 8 to learn which controls are useful for different
purposes. Then use Appendix G to learn about specific controls’ properties, methods, and events.
Throughout your work, you can also refer to the appendixes to get information on specific classes,
controls, and syntax. For example, you can quickly find the syntax for declaring a generic class in
Appendix M. If you need more information on generics, you can find it in Chapter 29 or the online help.
If you just need to refresh your memory of the basic syntax, however, scanning Appendix M will
be faster.
Necessary Equipment
To read this book and understand the examples, you will need no special equipment. To use Visual Basic
2008 and to run the examples found on the book’s web page, you need any computer that can reasonably
run Visual Basic 2008. That means a reasonably modern, fast computer with a lot of memory. See the
Visual Basic 2008 documentation for Microsoft’s exact requirements and recommendations.
To build Visual Basic 2008 programs, you will also need a copy of Visual Basic 2008. Don’t bother
trying to run the examples shown here if you have a pre-.NET version of Visual Basic such as Visual
Basic 6. The changes between Visual Basic 6 and Visual Basic .NET are huge, and many Visual Basic
.NET concepts don’t translate well into Visual Basic 6. With some experience in C#, it would be much
easier to translate programs into that language.
You can even use the free Visual Basic 2008 Express Edition. For more information, go to
msdn2.microsoft.com/en-us/express/default.aspx.
Much of the Visual Basic 2008 release is compatible with Visual Basic 2005 and earlier versions of Visual
Basic .NET, however, so you can make many of the examples work with earlier versions of Visual Basic
.NET. You will not be able to load the example programs downloaded from the book’s web site, however.
You will need to copy and paste the significant portions of the code into your version of Visual Basic.
To use UAC security, you must have UAC security installed on your computer. UAC is installed and
activated by default in the Windows Vista operating system.
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45. Introduction
xxxvii
Conventions
To help you get the most from the text and keep track of what’s happening, a number of conventions
have been used throughout the book.
Tips, hints, tricks, and asides to the current discussion are offset and placed in italics like this.
As for styles in the text:
❑ Important words are highlighted when they are introduced.
❑ Keyboard strokes are shown like this: Ctrl+A.
❑ File names, URLs, and code within the text are shown like this: persistence.properties.
❑ Code is presented in the following two different ways:
In code examples, new and important code is highlighted with a gray background.
The gray highlighting is not used for code that’s less important in the present
context, or has been shown before.
The Book’s Web Site
Programming environments such as Visual Basic and Windows operating systems are not static so books
about them shouldn’t be either. Modern programming books are linked with web sites that provide
example programs, forums for questions and discussion, lists of corrections and changes, and other
supplementary material.
This book is no exception. If you don’t visit the book’s web sites, you are not getting full value for
your money.
To visit the book’s Wrox web site, go to www.wrox.com and search for the book’s title or ISBN, or for the
author’s name Rod Stephens. This web site includes author information, excerpts, example programs
that you can download, any corrections that may be necessary, and a discussion forum.
Please visit the book’s web sites. Download the example programs so you can try out the code in the
book. I monitor the Wrox forum closely and answer questions as quickly as I can.
The book’s author web site, www.vb-helper.com/vb_prog_ref.htm, contains similar material, plus
some extra examples. The main VB Helper web site also contains thousands of tips, tricks, and examples
written in various versions of Visual Basic.
To keep informed of changes to this book or my other books, you can sign up for one of my newsletters
at www.vb-helper.com/newsletter.html. The newsletters, which are sent approximately once a
week, include Visual Basic tips, tricks, and examples, in addition to updates on my books and other
thoughts about Visual Basic development.
If you have corrections or comments, please send them to me at RodStephens@vb-helper.com. I will
do my best to keep the web sites as up-to-date as possible.
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46. Introduction
xxxviii
Wrox Errata
We make every effort to ensure that there are no errors in the text or in the code. However, no one is
perfect, and mistakes do occur. If you find an error in one of our books (such as a spelling mistake or
faulty piece of code), we would be very grateful for your feedback. By sending in errata, you may save
another reader hours of frustration and, at the same time, you will be helping us provide even higher
quality information.
To find the errata page for this book, go to www.wrox.com and locate the title using the Search box or
one of the title lists. Then, on the book details page, click the Book Errata link. On this page, you can
view all errata that has been submitted for this book and posted by Wrox editors. A complete book list
including links to each book’s errata is also available at www.wrox.com/misc-pages/booklist.shtml.
If you don’t spot “your” error on the Book Errata page, go to www.wrox.com/contact/techsupport
.shtml and complete the form there to send us the error you have found. We’ll check the information
and, if appropriate, post a message to the book’s errata page and fix the problem in subsequent editions
of the book.
p2p.wrox.com
For author and peer discussion, join the P2P forums at p2p.wrox.com. The forums are a Web-based
system for you to post messages relating to Wrox books and related technologies, and to interact with
other readers and technology users. The forums offer a subscription feature to e-mail you topics of
interest of your choosing when new posts are made to the forums. Wrox authors, editors, other industry
experts, and your fellow readers are present on these forums.
At p2p.wrox.com, you will find a number of different forums that will help you not only as you read
this book, but also as you develop your own applications. To join the forums, just follow these steps:
1. Go to p2p.wrox.com and click the Register link.
2. Read the terms of use and click Agree.
3. Complete the required information to join, as well as any optional information you wish to
provide, and click Submit.
4. You will receive an e-mail with information describing how to verify your account and complete
the joining process.
You can read messages in the forums without joining P2P, but to post your own messages, you
must join.
When you join, you can post new messages and respond to messages other users post. You can read
messages at any time on the Web. If you would like to have new messages from a particular forum
e-mailed to you, click the Subscribe to this Forum icon by the forum name in the forum listing.
For more information about how to use the Wrox P2P, be sure to read the P2P FAQs for answers to
questions about how the forum software works, as well as many common questions specific to P2P and
Wrox books. To read the FAQs, click the FAQ link on any P2P page.
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47. Introduction
xxxix
Visual Basic 2008 Version 1 Warning
Due to a configuration error when shipping the first versions of Visual Basic 2008, when you create a
new WPF project the result contains a bug. The template project tries to return a System.Windows
.Application object from a function that should return a WpfApplication1.Application object.
The error is:
Option Strict On disallows implicit conversions from
‘System.Windows.Application’ to ‘WpfApplication1.Application’.
The error occurs in the Return statement in this code:
<Global.System.Diagnostics.CodeAnalysis.SuppressMessageAttribute( _
“Microsoft.Performance”, “CA1811:AvoidUncalledPrivateCode”)> _
Friend ReadOnly Property Application() As Application
Get
Return Global.System.Windows.Application.Current
End Get
End Property
To fix the problem, hover over the red box displayed by Visual Basic to get the Error Correction Options
dropdown. Accept the error correction suggestion to get this fix:
Return CType(Global.System.Windows.Application.Current, _
WpfApplication1.Application)
This error should be fixed in the first service packs and later releases of Visual Basic 2008.
Meanwhile be aware of this issue when you read Chapters 5, 11, 12, and 13. For more information on this
issue, see support.microsoft.com/default.aspx/kb/945756.
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49. Part I
IDE
Chapter 1: Introduction to the IDE
Chapter 2: Menus, Toolbars, and Windows
Chapter 3: Customization
Chapter 4: Windows Form Designer
Chapter 5: WPF Designer
Chapter 6: Visual Basic Code Editor
Chapter 7: Debugging
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