Beginning Web Development, Silverlight, and ASP.NET AJAX

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230 CHAPTER 9 ■ .NET 3.0: WINDOWS WORKFLOW FOUNDATION Notice that the exposed web method is called doCToF, as this is what you defined on the interface. Also, when you select doCToF to call up its test page, you’ll see that you can enter the value for nC (see Figure 9-20). Figure 9-20. Entering the nC value Clicking Invoke will now call the workflow and convert the input value from centigrade to Fahrenheit, returning the answer in an XML-encoded double. This example shows how straightforward it is to use WF to create a workflow and expose it as a web service. It’s worth playing and experimenting with, as, particularly for large complex transactions, you can drastically reduce the amount of code that you have to write and encapsulate business processes in easy-to-manage redistributable libraries that can be published as web services or hosted within web applications. Summary WF is a powerful and flexible design and runtime environment that allows you to encapsulate your business processes into a visual design and then compile and implement that design into a working program. This can come in particularly handy for web development, where you can neatly bundle up some very sophisticated functionality behind redistributable libraries or hosted, sharable web services. As you design your web appli-
CHAPTER 9 ■ .NET 3.0: WINDOWS WORKFLOW FOUNDATION 231 cation infrastructure, it’s a good idea to start thinking about it in terms of workflow—and if complex systems and interactions can be designed as a workflow, you may save yourself and your company a lot of time and money by implementing it in WF. As such, WF, as one of the foundations of .NET 3.0, has a well-deserved place in the architecture of the future Web, and is a resource well worth learning and understanding. The simple applications that you learned in this chapter are but a taste of what is possible with WF. If you want to learn more about WF, a terrific resource to begin with is Microsoft Windows Workflow Foundation Step by Step, by Kenn Scribner (Microsoft Press, 2007).
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The EXPERT’s VOIce ® in .NET Beg
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Beginning Web Development, Silverli
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Contents About the Author . . . . .
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■CONTENTS ix ■CHAPTER 5 ASP.NET
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■CONTENTS xi ■CHAPTER 11 Ajax A
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■CONTENTS xiii ■CHAPTER 15 Enha
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About the Author ■LAURENCE MORONE
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Introduction This book is aimed at
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PART 1 Building Web Applications
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4 CHAPTER 1 ■ INTRODUCTION TO WEB
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10 CHAPTER 2 ■ BASICS OF WEB DEVE
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38 CHAPTER 3 ■ WEB FORMS WITH ASP
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CHAPTER 4 Data Binding with ASP.NET
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CHAPTER 4 ■ DATA BINDING WITH ASP
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106 CHAPTER 5 ■ ASP.NET WEB SERVI
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CHAPTER 6 Deploying Your Web Site I
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CHAPTER 6 ■ DEPLOYING YOUR WEB SI
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CHAPTER 7 .NET 3.0: Windows Communi
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CHAPTER 7 ■ .NET 3.0: WINDOWS COM
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CHAPTER 8 .NET 3.0: Windows Present
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CHAPTER 12 ■ AJAX EXTENSIONS FOR
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CHAPTER 13 Ajax Scripts and Service
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CHAPTER 13 ■ AJAX SCRIPTS AND SER
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332 CHAPTER 14 ■ JAVASCRIPT PROGR
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CHAPTER 15 Enhancing the Web Experi
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CHAPTER 15 ■ ENHANCING THE WEB EX
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376 CHAPTER 16 ■ PROGRAMMING SILV
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416 ■INDEX applications. See also
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418 ■INDEX copying web sites, 25
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420 ■INDEX ■H H path language c
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422 ■INDEX object orientation, 16
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424 ■INDEX Sequential Workflow Co
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Beginning Web Development, Silverlight, and ASP.NET AJAX

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