DataEntryandValidationwithC#andVB.NETWindowsForms2003.pdf

Data Entry and Validation with C# and VB .NET Windows Forms

by Nick Symmonds

ISBN:1590591089

This text demonstrates design patterns for everyday data entry programming tasks, showing

the pitfalls of using some of the .NET controls and how to program around them.

Table of Contents

Data Entry and Validation with C# and VB .NET Windows Forms

Introduction

Chapter 1 - The .NET Data Entry Controls

Chapter 2 - UI Design Considerations for Data Entry

Chapter 3 - Data Presentation Screen Issues

Chapter 4 - Keyboard- and Mouse-Based Data Entry

Chapter 5 - The Object-Oriented GUI

Chapter 6 - Advanced Data Entry

Chapter 7 - Error Handling

Chapter 8 - Advanced Validation and Custom Data Validation Controls

Chapter 9 - XML Data Entry and Validation

Chapter 10 - Keeping Users Happy

Chapter 11 - Pulling It All Together

Application Blocks

Index

List of Figures

List of Tables

List of Listings

List of Sidebars

Back Cover

The old hacker adage “Garbage in, garbage out” has never been so important as it is today. With ever-

increasing amounts of information flowing into and out of modern applications, the task of an application

developer to control and verify information is critically important to any software project.

For the first time, Data Entry and Validation with C# and VB .NET Windows Forms brings together current

knowledge on this subject in an understandable, easy-to-read form. Covering development and best practices

for data entry and validation, including GDI+, custom controls, localization, accessibility, proper data

validation techniques, and best practices with Visual Basic and C#, Data Entry and Validation with C# and VB

.NET Windows Forms is a book no modern programmer should be without.

About the Author

Nick Symmonds works for the Security and Safety Solutions division of Ingersoll-Rand, developing and

integrating security software. He started out his professional life as an electronics technician. While getting his

bachelor's degree in electrical engineering from the University of Hartford, he started to gravitate toward

programming. Nick has spent quite a few years programming in assembly, C, C++, and Visual Basic. Recently,

he has latched onto .NET like a lamprey and loves digging into the .NET core. Nick has written several articles

on programming and has two books currently out: Internationalization and Localization Using Microsoft .NET

(Apress, 2002) and GDI+ Programming in C# and VB .NET (Apress, 2002).

Data Entry and Validation with C# and VB .NET

Windows Forms

Nick Symmonds

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Technical Reviewer: Adriano Baglioni

Editorial Board: Dan Appleman, Craig Berry, Gary Cornell, Tony Davis, Steven Rycroft, Julian

Skinner, Martin Streicher, Jim Sumser, Karen Watterson, Gavin Wright, John Zukowski

Assistant Publisher: Grace Wong

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Copy Editor: Nicole LeClerc

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section.

For Celeste. You are the love of my life.

About the Author

Nick Symmonds started out his professional life as an electronics technician. While getting his

bachelor's degree in electrical engineering from the University of Hartford, he started to gravitate toward

programming. Nick has spent quite a few years programming in assembly, C, C++, and VB. Recently,

he has latched onto .NET like a lamprey and loves digging into the .NET core. Nick has written several

articles on programming and has two books currently out: Internationalization and Localization Using

Microsoft .NET (Apress, 2002) and GDI+ Programming in C# and VB .NET (Apress, 2002). He works

for the Security and Safety Solutions division of Ingersoll-Rand, developing and integrating security

software.

Nick lives with his family in the northwest hills of Connecticut and enjoys golfing, biking, and exploring

the hills on his motorcycle.

About the Technical Reviewer

Adriano Baglioni got his first taste of computers as a freshman in high school, using BASIC on a

PDP-11/70. He pursued his interest in computers at Rensselaer Polytechnic Institute (RPI), where he

graduated with a bachelor's degree in computer and systems engineering. He followed that up with a

master's degree in computer science, also from RPI. He has worked in the computer industry for 20

years, programming mostly in C and C++. His experience runs the gamut from embedded programming

on 8051s to scientific programming on mainframes. He currently works at Veeder-Root Co., developing

software for environmental monitoring equipment.

When it's time to take a break from the computer, Adriano enjoys hiking, biking, and camping with his

wife, Carol.

Acknowledgments

This is my third book for Apress. Each time it becomes more enjoyable. The level of professionalism

within this company is unparalleled. Thanks to Beth Christmas for keeping me on track as my project

manager. Nicole LeClerc did a wonderful job again as copy editor. I can't believe how fast you do what

you do. Thanks to all those at Apress who helped and advised me on this book.

Special thanks go out to Adriano Baglioni. Without his technical review comments, this book would not

be nearly as good as it is. It was a pleasure working with you again.

Introduction

Anyone who has ever worked with a computer has had to enter data into it somehow. Anyone who has

done any Windows programming (or DOS programming, if you go back far enough) has had to write

data entry screens. What is data entry without some kind of validation?

Then again, what is validation? Validation is the process of the receiving data (via the keyboard, the

mouse, voice, serial connections, and so on) and making sure that the data meets the specifications

you have laid out. For instance, if you are looking for a number but receive a character, your validation

code would ignore that character.

I wrote this book because it encompasses pretty much what most Windows programmers do on a day-

to-day basis. As programmers, we all work with data. We collect it, massage it, store it, retrieve it, and

present results back to the user. As a matter of fact, data entry and validation are likely such constant

themes throughout your programming day that I bet you don't even realize you're doing them.

When most new programmers think of data entry, they think "Booooring!" What often comes to mind

are endless screens of text-based data entry fields for insurance companies. Where is the fun in that?

After all, there is no chance for any creativity and after a few weeks of this kind of work, life becomes

dull. It seems like assembly-line programming at its worst.

Data Entry Code Can Be Interesting

Is data entry and validation really this simple and dull? I think not. If it were, I would have changed

professions long ago.

Data entry involves two aspects. One is to collect data and the other is to make sure the data makes

sense. The fun part is how you go about programming it.

If you think that writing screen after screen of data entry fields is boring, how do you think end users

feel using these screens? I would say they feel even more bored. Your job as a programmer here is

twofold. First, you need to make the data entry screens not so boring to use, and second, you need to

make the screens not so boring to program. An additional task is to make the screens sensible. The

only thing worse to a user than an uninteresting program is a frustrating one. How many times have you

used a program and had to hunt down certain data fields in screens where they don't belong? You tend

to wonder, what were they thinking?! Perhaps you have received some feedback like this about your

own program.

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