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Here I m composing my intent by chaining several operations together .1 This code was easy for me to write and is easy for others to read and maintain because the intent is obvious: Take a string, grab a portion of it, uppercase that portion, and see if it ends with an E . This is great, but there is a big assumption being made here: no operation fails . But, of course, errors are always possible, so we need a way to handle those errors . In fact, there are many object-oriented constructs constructors, getting/setting a property, adding/removing an event, calling an operator overload, calling a conversion operator that have no way to return error codes, but these constructs must still be able to report an error . The mechanism provided by the Microsoft .NET Framework and all programming languages that support it is called exception handling . Important Many developers incorrectly believe that an exception is related to how frequently

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NET run-time characteristics such as the authentication scheme and registered HTTP handlers and modules User-defined applications can extend the XML schema of the CONFIG file by defining custom sections with custom elements By default, however, the AppSettingsReader class supports only settings expressed in a few formats, such as name/value pairs and a single tag with as many attributes as needed This schema fits the bill in most cases, but when you have complex structured information, it soon becomes insufficient Information is read from a section using special objects called section handlers If no predefined section structure fits your needs, you can provide a tailor-made configuration section handler to read your own XML data, as shown here: <configuration> <configSections> <section name="MySection" type="MySectionHandlerClass, assembly" /> </configSections> 10.

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An important feature of VPNs is that the public physical network through which private data is sent becomes transparent to the two endpoints of communication, as illustrated in Figure 10-28. Two computers, Computer1 and Computer2, are physically connected only through the Internet. The transparency of this physical link is revealed in Figure 10-28 by the results of the Tracert command run at each computer. Although many hops separate the two computers, each appears to the other as only one hop away through the VPN connection. Communication occurs between the two private IP addresses, each within the 192.168.10.0 subnet, as if the computers were both located on an isolated network segment.

something happens . For example, a developer designing a file Read method is likely to say the following: When reading from a file, you will eventually reach the end of its data . Since reaching the end will always happen, I ll design my Read method so that it reports the end by returning a special value; I won t have it throw an exception . The problem with this statement is that it is being made by the developer designing the Read method, not by the developer calling the Read method . When designing the Read method, it is impossible for the developer to know all of the possible situations in which the method gets called . Therefore, the developer can t possibly know how often the caller of the Read method will attempt to read past the end of the file . In fact, since most files contain structured data, attempting to read past the end of a file is something that rarely happens .

Tracing route to computer2 [192.168.10.2]

In this section, I ll introduce the mechanics and C# constructs needed in order to use exception handling, but it s not my intention to explain them in great detail . The purpose of this chapter is to offer useful guidelines for when and how to use exception handling in your code . If you want more information about the mechanics and language constructs for using exception handling, see the .NET Framework documentation and the C# language specification . Also, the .NET Framework exception-handling mechanism is built using the Structured Exception Handling (SEH) mechanism offered by Microsoft Windows . SEH has been discussed in many resources, including my own book, Windows via C/C++, 5th ed . (Microsoft Press, 2007), which contains three chapters devoted to SEH . The following C# code shows a standard usage of the exception-handling mechanism . This code gives you an idea of what exception-handling blocks look like and what their purpose is . In the subsections after the code, I ll formally describe the try, catch, and finally blocks and their purpose and provide some notes about their use .

over a maximum of 30 hops:

In fact, C# s extension method feature exists in the language to allow you to chain more methods together that would not have been chainable otherwise .

1 460 ms 460 ms 580 ms COMPUTER2 [192.168.10.2]

<MySection> </MySection> </configuration> A configuration section handler is simply a NET Framework class that parses a particular XML fragment extracted from the CONFIG file We'll look at custom section handlers in more detail in 15 Interoperability XML is key to making NET Framework applications interoperate with each other and with external applications running on other software and hardware platforms XML interoperability is a sort of blanket term that covers three NET-specific technologies: XML Web services, remoting, and XML object serialization By rolling functionality into an XML Web service, you can expose the functionality to any application on the Web that, irrespective of platform, speaks HTTP and understands XML Based on open standards (HTTP and XML, but also SOAP), XML Web services are an emerging technology for system interoperation and are supported by the major players in the IT industry The .

Tracing route to computer1 [192.168.10.1]

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