c# generate barcode from string Lesson Review in Visual C#

Making GS1 - 13 in Visual C# Lesson Review

Lesson Review
Generating GTIN - 13 In C#
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EAN-13 Supplement 5 Recognizer In C#.NET
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You can use the following questions to test your knowledge of the information in Les son 2, Polling Web Methods for Completion. The questions are also available on the companion CD if you prefer to review them in electronic form.
Draw Bar Code In Visual C#
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Decoding Barcode In C#.NET
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NOTE
EAN 13 Maker In VS .NET
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Paint EAN-13 Supplement 5 In VS .NET
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Answers
Encode EAN-13 Supplement 5 In VB.NET
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Barcode Maker In Visual C#
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Answers to these questions and explanations of why each answer choice is right or wrong are located in the Answers section at the end of the book.
EAN / UCC - 14 Creator In Visual C#.NET
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Draw USS Code 39 In Visual C#.NET
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1. Which method is an appropriate means to poll for a Web method s completion (Select the best answer.) A. Use an IAsyncResult object in conjunction with a standard invocation and poll for the IsCompleted property to turn true. B. Use an IAsyncResult object in conjunction with an asynchronous invocation and poll for the IsCompleted property to turn true. C. Use a callback method and wait for its IsCompleted property to turn true. D. Mark the method with a OneWay attribute.
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British Royal Mail 4-State Customer Code Printer In C#
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7
Barcode Creation In Java
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Barcode Creation In Objective-C
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Method Invocations and Event Management with .NET Web Services
PDF 417 Decoder In Visual Studio .NET
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Decoding EAN / UCC - 14 In C#
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2. How do calls through a delegate differ from traditional ones (Select all that apply.) A. They have a different signature and return type in most cases. B. Other methods can be processed while the call to the Web method is processing. C. The Completed event must be handled to get the results back. D. The method call is for all intents and purposes identical to the synchronous counterpart. 3. Which of the following characterize Web method calls (Select all that apply.) A. Client code calls the Web service directly. B. Client code calls the proxy class that corresponds to the Web service. C. Web services can only be called asynchronously by using separate threads. D. Asynchronous calls can be implemented using delegates or separate threads.
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Generating PDF417 In Visual Basic .NET
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7 Review
Barcode Creator In None
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Encoding Code 39 Extended In .NET
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Review
To further practice and reinforce the skills you learned in this chapter, you can per form the following tasks:
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involv ing the topics of this chapter and ask you to create a solution. Complete the suggested practices. Take a practice test.
Summary
.NET Web services allow you to expose data to outside consumers as Extensible Markup Language (XML). Web methods of those Web services behave virtually identically to how normal methods behave. .NET Web services can be created and consumed in any .NET language. .NET Web services can be consumed by anything that can parse XML, which is how the data is returned. A Web reference is needed to consume a Web service. After a Web reference is added to a project, Visual Studio 2005 creates a class that maps to the Web service s methods and properties, which allows you to interact with the Web service as though it were local. Web methods can be called just like traditional methods. Invocations can be done either asynchronously or synchronously. To implement fire and forget functionality, you can use the OneWay attribute on Web methods. The two methods you can use to determine when a Web method has finished executing are polling and callbacks. Semantically, callbacks are much more elegant than polling.
7 Review
Key Terms
Do you know what these key terms mean You can check your answers by looking up the terms in the glossary at the end of the book.
asynchronous blocking callback fire and forget synchronous Web method Web service
Case Scenarios
In the following case scenarios you apply what you ve learned about how to use Web methods and Web services. You can find answers to these questions in the Answers section at the end of this book.
Case Scenario 1: Exposing Functionality Through .NET Web Services
Many companies expand operation over time and need much of their functionality exposed to external customers. .NET Web services and .NET remoting are two of the primary vehicles that make this available. The following case study concerns itself with developing a Web services strategy.
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