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The first if block tests if the argument count is zero, then the second tests if there is a single argument, and so on. Let s look at the first test: if (args.Length == 0) { reader = Console.In; writer = Console.Out; } Here, the source and destination of the lottery number data stream are the console input and output streams. The code assigns the reader and writer variables. If the command line had no arguments or if one of the command-line argument tests has been verified, the IProcessor implementation is called: writer.Write(processor.Process(reader.ReadToEnd())); The code directly executes writer.Write(), processor.Process(), and reader.ReadToEnd(). There is no verification of whether writer, processor, or reader point to actual object instances. There could be a case for adding code that verifies if processor references an actual object instance, but there is absolutely no point to adding code to verify if writer and reader reference actual object instances. Doing so would imply that your truth test block is incomplete and you have not thought through all the permutations that assign writer and reader. Let s look at the next truth test, which indicates that there is one command-line argument. When there is one command-line argument, you need to verify which of the two commandline variations it is: TestProcessor.exe -help

If certain web sections need to list large numbers of products, it s useful to let the visitor browse them page by page, with a predefined (or configurable by the visitor) number of products per page. Depending on the tier on your architecture where paging is performed, there are two main ways to implement paging:

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or: TestProcessorexe lottotxt The first variation has an explicit command-line parameter -help The second variation is the identifier of a file that contains the input data Thus, the second if block contains another if block to test another aspect of the truth test: else if (argsLength == 1) { if(args[0] == "-help") { DisplayHelp(); return; } else { reader = FileOpenText(args[0]); writer = ConsoleOut; } } When testing for the -help argument, immediately after calling DisplayHelp(), you must use the return keyword This is extremely important because, when the console application calls DisplayHelp(), it is saying, I don t care where the input or output data is coming from since I am doing something else and thus must stop processing If you were to continue processing, the writer and reader could reference invalid states and cause an exception to be generated.

Paging at the database level: In this case, the database returns only the page of products the visitor wants to see. Paging at the application level: In this scenario, the data tier always returns the complete list of products for a certain section of the site, and the presentation tier objects (such as the GridView control) extract the requested page of products from the complete list. This method has potential performance problems especially when dealing with large result sets, because it transfers unnecessarily large quantities of data from the database to the presentation tier. Additional data also needs to be stored on the server s memory, unnecessarily consuming server resources. In our web site, we ll implement paging at the data tier level, not only because of its better performance, but also because it allows you to learn some tricks about database programming that you ll find useful when developing your web sites. You ll write stored procedures that take as parameter a page number, and return only the products that appear in that page. This technique is powerful because of flexibility and performance reasons. In the following pages, you ll learn how to write smart stored procedures that return a specific page of records. Say, the first time the visitor searches for something, only the first n matching products are retrieved from the database. Then, when the visitor clicks Next page, the next n rows are retrieved from the database, and so on.

If all tests have been tried and failed, then the final else calls the method DisplayHelp() to indicate that the command line is incorrect, and the help shows the correct command line Doing a complete test and debug of the console application is difficult because of the streaming facilities When you stream data from one process to another, a process is started and stopped without an easy way for the debugger to jump in between Thus, to be able to debug and verify if everything works, another strategy is needed The solution is to use preprocessor directives (discussed in 6), like the following #if DEBUG_OUTPUT ConsoleWriteLine("Argument count(" + argsLength + ")"); foreach( string argument in args) { ConsoleWriteLine( "Argument (" + argument + ")"); } #endif The directive code is executed if DEBUG_OUTPUT is defined.

Tip We ll cover this theory for SQL Server 2005 and 2008. If you happen to be working with an older

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