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The final class in this discussion is System.Net.IPEndPoint. This class represents a combination of a host address and port that can be used to contact a service on a remote computer. This class is used extensively with the lower-level networking classes discussed in "Programming with Native Sockets" later in this chapter. Instances of IPEndPoint are created using an IPAddress to represent the host and an integer to represent the port number, as follows:
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TRANSLATE REPLACE_1 REPLACE_2 ----------- ----------- --------miik muckit milk bucket bucket
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The comment on the right of the class definitions above indicates the real name of the type the compiler will emit into the type definition metadata table; this is the real name of the type from the CLR s perspective . Some compilers don t support namespaces at all, and other compilers are free to define what namespace means to a particular language . In C#, the namespace directive simply tells the
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Phased integration can t begin until late in the project, after all the classes have been developer-tested. When the classes are finally combined and errors surface by the score, programmers immediately go into panicky debugging mode rather than methodical error detection and correction. For small programs no, for tiny programs phased integration might be the best approach. If the program has only two or three classes, phased integration might save you time, if you re lucky. But in most cases, another approach is better.
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The most difficult and challenging aspect of equivalence class partitioning is our ability to decompose data into unique valid and invalid class subsets. We must be familiar with various types of data and understand how the program and the system process, manipulate, transfer, and store data. We must also know common or likely input variables and review failure indicators such as historically problematic variables (for example, known problematic test data, high-risk data). We must also take into consideration external factors such as user profiles, specifications, and requirements that often help us define the appropriate context. Overgeneralizing and insufficiently decomposing the variable data results in a reduction in the number of subsets in a particular class, and the likelihood of missing errors increases. Hyperanalyzing or overly decomposing variable data into nonunique subsets increases the number of potentially redundant tests; however, redundant tests might not expose additional errors and have a low probability of providing new relevant information. I recommend you err on the side of caution because you can always cull redundant tests. However, if you miss a critical problem as a result of overgeneralizing the test data, the cost could be quite large. The data decomposition theory for equivalence class partitioning provides the basis for understanding why knowledge of the system and the domain space is critical for the greatest success and the maximum effectiveness of this technique. ECP Data Decomposition Theory Overgeneralization of variable data reduces the base number of ECP tests but increases the probability of missing errors or generating false negatives or false positives. Hyperanalysis of variable data increases the probability of redundancy, which can reduce the overall efficiency of the test approach. Initially, we must separate the data into two classes. Valid class data includes the set of variable elements that return a positive result under usual circumstances. In other words, the data is expected not to generate an error condition or cause an unexpected failure. Invalid class data includes the set of variable elements that are expected to result in an error condition. Most error conditions are trapped by an error handler, but occasionally invalid class data has an increased probability of exposing errant behavior or failures. Once the data is separated into valid and invalid classes of data, the tester must carefully analyze the data in each class and further decompose the data in each class into discrete subsets in that class. Essentially, any element in any individual subset of data in either the valid or invalid class should code 39 barcode
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This chapter covers the fundamentals involved in building an ASP .NET application . From a syntactical point of view, writing .NET code is similar to writing the classic ASP code that you might have seen during the late dot-com era . Many of the key symbols remain the same, and even some of the syntax survives directly . However, the entire underlying execution model changed dramatically between classic ASP and ASP .NET . Whereas executing classic ASP pages was primarily an exercise in rendering HTML, interpreting script code, and calling Component Object Model (COM) code, ASP .NET introduces an entirely new object-oriented execution model . ASP .NET execution centers around Common Language Runtime (CLR) classes that implement an interface named IHttpHandler . ASP .NET includes a number of classes that already implement IHttpHandler, and you can actually write your own implementation from scratch . Typically, though, you ll write ASP .NET pages that, under the covers, are generated by an ASP . NET-provided IHttpHandler . This chapter examines the ASP .NET execution model to see how ASP .NET enables its features . It takes a bottom-up approach, showing how the simplest ASP .NET page executes . Along the way, it introduces various ASP .NET programming techniques, including code behind . You will see how ASP .NET s compilation model works . Finally, you can observe how ASP .NET s Web Form architecture operates and how it s all nicely wrapped up by Microsoft Visual Studio 2010 . You can start by studying a simple page to discover how you can evolve it using ASP .NET s programming techniques . Important This chapter s code samples on the companion CD require IIS support to execute .
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The WebService class represents a base class for creating XML web services in ASP.NET. This class is similar to the Page class for webpages. It provides access to ASP.NET objects such as Application and Session. It is important to note that this class is optional: you do not need to inherit from this class to create XML web services. Instead, you use this class as a base class only when you want to access and use the features of an ASP.NET application. You might, for example, need to use session state between service calls. You could do so easily by first inheriting from this class and then accessing the session object as if you were coding an ASP.NET webpage. If, however, you simply want to expose methods over HTTP and don t need to access the features of ASP.NET, your web service need not inherit from this class (or any other class). The following code shows the start of the Authors example web service. Here, the Authors class inherits directly from the WebService base class.
// This demonstrates Convert s range checking try { c = Convert.ToChar(70000); // Too big for 16 bits Console.WriteLine(c); // Doesn t execute } catch (OverflowException) { Console.WriteLine("Can t convert 70000 to a Char."); }
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