C# .NET Web Developer''''s Guide phần 1 pps

He has been working on the Microsoft .NETplatform since fall 2000, specializing in developing enterprise systems using WebServices.. He holds a Bachelor’s degree in Information Systems a

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C# NET Web Developer’s Guide

Copyright © 2002 by Syngress Publishing, Inc All rights reserved Printed in the United States of America Except as permitted under the Copyright Act of 1976, no part of this publication may be reproduced or distributed in any form or by any means, or stored in a database or retrieval system, without the prior written permission of the publisher, with the exception that the program listings may be entered, stored, and executed in a computer system, but they may not be reproduced for publication.

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Acknowledgments

Todd Carrico(MCDBA, MCSE) is a Senior Database Engineer for

Match.com Match.com is a singles portal for the digital age In addition to itsprimary Web site, Match.com provides back-end services to AOL, MSN, andmany other Web sites in its affiliate program.Todd specializes in design anddevelopment of high-performance, high-availability data architectures primarily

on the Microsoft technology His background includes designing, developing,consulting, and project management for companies such as Fujitsu, Accenture,International Paper, and GroceryWorks.com In addition to his contribution to

C# NET Web Developer’s Guide,Todd has also contributed chapters to other

books in the Syngress NET Series including the ASP NET Web Developer’s

Guide, and the VB NET Developer’s Guide.Todd resides in Sachse,TX, with his

wife and two children

Mark Tuttis a Senior Software Engineer with MICROS Systems MICROSprovides complete information management solutions for the hospitality

industry, including software, hardware, enterprise systems integration, consulting,and support Mark is the principle designer of a number of software packages,including Guest Service Solution, a customer relationship management systemfor the MICROS Restaurant Enterprise Series platform In addition to hisproduct development duties, Mark is a key contributor to the design and devel-opment of system integration software and customer-specific product exten-sions that allow MICROS clients to fully integrate MICROS products intotheir overall technology plans Mark currently resides in Baltimore, Marylandwith his wife Malinda and their twin sons, Fred and Jackson

Jason Werry(MCSD) runs a consulting firm, Synergy Data Solutions, inAustralia He currently provides strategic and technical consulting to his clientsand specializes in Windows-based enterprise systems development Jason has anextensive background using Microsoft technologies and is currently developingstate-of-the-art,Web-based applications on the NET platform His clients haveranged from a Taiwanese multimedia company to various government depart-ments and local startups A natural born programmer, Jason started coding Z80 processors in Assembly at age 13 Since then he has used most popular

vi

programming languages and presently enjoys working with SQL Server, MTS,IIS,Visual Basic, and C# Jason holds a bachelor’s degree in Mathematics/Computer Science from The University of Queensland He dedicates his

writing to his loving wife, LiHsing

Patrick Coelho(MCP) is an Instructor at The University of WashingtonExtension, North Seattle Community College, Puget Sound Center, and SeattleVocational Institute, where he teaches courses in Web Development (DHTML,ASP, XML, XSLT, C#, and ASP NET) Patrick is a Co-Founder of

DotThatCom.com, a company that provides consulting, online developmentresources, and internships for students He is currently working on a NETsolution with contributing author David Jorgensen and nLogix Patrick holds aBachelor’s of Science degree from the University of Washington, Bothell.Patrick lives in Puyallup,WA with his wife Angela

David Jorgensen (MCP) is an Instructor at North Seattle Community

College, University of Washington extension campus, and Puget Sound Centers

He is also developing courses for Seattle Vocational Institute, which teaches.NET and Web development to the underprivileged in the Seattle area Davidalso provides internship opportunities through his company DotThatCom.com,which does online sample classes and chapters of books David holds a bach-elor’s degree in Computer Science from St Martin’s College and resides inPuyallup,WA with his wife Lisa and their two sons Scott and Jacob

Greg Hackis a Senior Software Engineer with Allscripts Healthcare Solutions.Greg has over 15 years experience developing software on platforms rangingfrom the mainframe to the desktop using a wide variety of languages and tech-nologies Recent work includes a Web-based application that allows patients toview their medical records and a Pocket PC application that delivers clinicalinformation to physicians at the point of care

Axel Goldbach is a Senior Consultant with modulo3 GmbH, a consulting

company based in Germany and specializing in project management consultingthroughout Europe modulo3 is a process implementation specialist for themajor networking frameworks, including eXtreme Programming, MSF and

V Modell Axel currently provides senior-level strategic and technical consulting

to all modulo3 clients in Germany and Central Europe His duties include ysis and development of multi-tiered applications in heterogeneous environments

Axel also works as a technical scout and trainer for modulo3 His training cialties include programming languages, networking, and academic fields such asdevelopment methodology, parser- and interpreter-technology, theory of com-plexity, and provable correct software

spe-Joseph Albahariis a freelance consultant and developer with over 10 yearsexperience in designing networked systems He has led a string of successfulprojects, from custom application frameworks for start-up companies, to high-performance OLAP and data warehousing systems for telecommunicationsgiants His knowledge in object-oriented user interface design has been calledupon in the planning or production of many large and complex systems, wherewell-balanced abstractions are of key importance Joseph is also experienced inSQL Server database administration, and has developed high-performance solu-tions for clients with specialized requirements—such as a replication systemproviding field level synchronization, or a high-throughput bulk-copying agent.Joseph holds a Bachelor’s degree in computer science and physics

Adrian Turtschi (MCSE, MCSD) is Lead Architect Solution Developmentwith Avanade (Germany), where he is responsible for the solution offering inthe mobile computing space He has been working on the Microsoft NETplatform since fall 2000, specializing in developing enterprise systems using WebServices He is particularly interested in using Web Services to bridge platformand system boundaries Prior to joining Avanade, Adrian worked for KPMG’sGlobal Knowledge Exchange in Boston, where he helped design and developKPMG's global knowledge management and collaboration solution, used by its100,000 professionals world-wide Adrian has work experience in Switzerland,the Netherlands, and the US He has degrees in Mathematics and ComputerScience He currently lives in Berlin, Germany

Technical Editor and Reviewer

Saurabh Nanduis the Founder of www.MasterCSharp.com which trates on teaching C# and NET He worked with HTML, JavaScript, Flash 5.0before he started programming in Java Saurabh has been impressed by thepower and flexibility of NET He is currently employed by YesSoftware Inc

concen-as Technical Evangelist

Technical Editor’s Acknowledgements

I would like to thank my friend Nanu Jogi without whose direction I wouldhave never got into working on the NET Platform I would also like to thank

my family, especially my brother Pritesh, for their support

Wei Meng Leeis Series Editor for Syngress Publishing’s NET DeveloperSeries He is currently lecturing at The Center for Computer Studies, NgeeAnn Polytechnic, Singapore.Wei Meng is actively involved in Web developmentwork and conducts training for Web developers and Visual Basic programmers

He has co-authored two books on WAP He holds a Bachelor’s degree in

Information Systems and Computer Science from the National University of

Singapore.The first and second books of the NET series, VB NET Developer’s

Guide (ISBN: 1-928994-48-2), and ASP NET Developer’s Guide (ISBN:

1-928994-51-2) are currently available from Syngress Publishing

Series Editor

This CD-ROM contains the code files that are used in each chapter of this book.The

code files for each chapter are located in a chXX directory (for example, the files for Chapter 8 are in the ch08 directory) Any further directory structure depends on the pro-

jects that are presented within the chapter

To work with the examples provided, you will need at least the Windows 2000 or

Windows XP Professional operating system with the latest service packs, IIS 5.x, and IE 6.0, since ASP.NET and Web Services (a part of ASP.NET) are not supported on earlier operating systems such as Windows 9x/WindowsME/WindowsNT Also needed is the

.NET SDK Beta2 (the latest public release available while writing this book) and theVisual Studio.NET Beta2 IDE

The C# NET Web Developer’s Guide provides you with extensive examples that will

help solve the problems you might face while developing applications for the NETPlatform rather than concentrating on the theory of C# and NET programming.Therefore code is the main feature of this book

The chapters contain both code snippets and sample programs that illustrate theprinciples discussed Chapter 2 presents a series of sample programs that introduce con-cepts in C# that are different from other object-oriented languages Chapter 4 helps youunderstand the basics of building Graphical User Interface (GUI)-rich Windows Formsapplications; the examples presented in this chapter are the launch pad for WindowsForms applications used in other chapters Similarly, code presented in Chapter 8 helpsyou to interact with various databases using ADO.NET; again, this chapter acts as a foun-dation for further chapters’ database coverage Chapter 9 will acquaint you with using.NET Class Libraries to interact with XML and its related technologies

Chapters 5, 6, and 11 discuss technologies and Application Program Interfaces (APIs)that help two applications to communicate and interact with each other Chapter 5

focuses on enabling applications to communicate over the TCP and UDP protocols andprovides an overview of the techniques used to interact with Web pages programmatically.Code examples in Chapter 6 and Chapter 11 concentrate on using Simple Object AccessProtocol (SOAP) and object serialization and deserialization

About the CD

func-Lastly, to end on a lighter note, Chapter 12 takes you through building a Jokes WebService.The code in this chapter helps you build both the Jokes Web Service as well asthe Windows Forms Client for the service.

Look for this CD icon to obtain files used

in the book demonstrations.

From the Series Editor

For many years, C and C++ programmers have been searching for alternative gramming languages that offer the same kind of flexibility and power of C and C++,but without the complexities and steep learning curve required for mastery of thelanguage.What many programmers desired was a language that would allow applica-tions to be built rapidly, but at the same time giving them the ability to code at lowlevel.The search has finally ended with Microsoft’s new language—C#, a member ofthe NET Framework

pro-C# is the revolutionary new language from Microsoft, designed solely to run onthe NET framework Drawing experiences from C, C++, and Visual Basic, C# wasdesigned to be a simple and modern object oriented programming language

But why learn C#? With the integration of C# and the Visual Studio.NET(known as Visual C#), developing Windows and Web applications has been radicallysimplified.With full access to the NET Class Libraries, C# includes built-in supportfor developing robust Web services and ASP.NET applications (It was reportedly saidthat Visual Studio.NET was built entirely using C# and that most of the examples inMSDN were coded in C#.That in and of itself is a very good reason to learn C#!)Besides this, C# enhances the productivity of programmers by eliminating commonerrors often associated with C and C++

While many of the earlier C# books have primarily focused on the language

syntax, The C# NET Web Developer’s Guide illustrates the uses of C# for Web

devel-opers looking to harness the new functionality and ease of this powerful ming language.The best way to learn a new language is by trying out the exampleswhile you are reading this book.Within many chapters, you will find numerous codeexamples used in various practical situations; this hands-on, code-intensive approachallows you to have a deeper understanding of issues involved in C# Web develop-ment, and at the same time allows you to cut and paste portions of applicable codeinto your current projects, thereby shortening development time

program-We are constantly working hard to produce the best technical books needed byprofessional programmers like you I sincerely hope you will enjoy reading this book

as much as the authors did writing it!

Wei Meng Lee, Series Editor Syngress NET Developer Series

Assemblies 16 Metadata 16

Reflection 19

Summary/Solutions Fast Track/Frequently Asked Questions 26

Introduction 34

Declaring the Main Method 43

xiii

Using the if Statement 49 Using the if-else Statement 50 Using the switch case Statement 50 Using the for Statement 51 Using the while Statement 52 Using the do while Statement 52 Using the break Statement 52 Using the continue Statement 53 Using the return Statement 54 Using the goto Statement 55

Delegates 70

Multicast 75 Events 79

Using the try Block 89 Using the catch Block 89 Using the finally Block 89 Using the throw Statement 89

Summary/Solutions Fast Track/Frequently Asked Questions 104

Contents xv

IntelliSense 122

Documentation Generation (XML Embedded Commenting) 127

Summary/Solutions Fast Track/Frequently Asked Questions 133

Introduction 138

xvi Contents

Summary/Solutions Fast Track/Frequently Asked Questions 196

Chapter 5 Network Programming:

Example TCP Command Transmission and Processing 214

Example UDP Command Transmission and Processing 227

The TCPServerSession Class 253 The TCPServer Class 256

The ChatServer Class 260 The ChatClient Class 265

The RemoteFileStreamServer Class 272 The RemoteFileStreamProxy Class 276 The FileSharingPeer Class 279

Redirection 290

Contents xvii

Authentication 291 Cookies 291 Summary/Solutions Fast Track/Frequently Asked Questions 292

Introduction 300

Updating Configuration Files Using the NET

Changing the Hosting Application to a Service 319 Using the TCP Channel with the Binary Formatter 321 Summary of the Improved Sample Application 321

Creating the CountServer Project 322 Creating the CountHost Project 325 Creating the CountClient Project 326

Understanding the Leasing and Sponsorship Code 329

Sending and Receiving Objects by Reference 333

Creating the VersionHost Project 336 Creating the VersionClient Project 337

Testing Side-By-Side Execution of Remote Objects 339 Summary/Solution Fast Track/Frequently Asked Questions 340

Introduction 346

Sending and Receiving Messages with Complex Objects 356

xviii Contents

Creating the DrawingSender Project 369 Creating the DrawingReceiver Project 373

Using Public Queues While Disconnected from the Network 378 Summary/Solutions Fast Track/Frequently Asked Questions 379

Summary/Solutions Fast Track/Frequently Asked Questions 426

XML and the DataSet Class 456 XML Schemas and the DataSet Class 461 Traversing Relations in the DataSet Class 464

Contents xix

Summary/Solutions Fast Track/Frequently Asked Questions 490

Introduction 496

Using VS.NET to Validate Form Input with a Regular Expression 538

Summary/Solutions Fast Track/Frequently Asked Questions 571

Introduction 576

Wiring Up Distributed Objects—The SOAP Protocol 581