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One common approach is to pass information using a query string in the URL You will commonly find this approach in search engines For example, if you perform a search on the Google website, you ll be redirected to a new URL that incorporates your search parameters Here s an example: http://wwwgoogleca/search q=organic+gardening The query string is the portion of the URL after the question mark In this case, it defines a single variable named q, which contains the organic+gardening string The advantage of the query string is that it s lightweight and doesn t exert any kind of burden on the server Unlike cross-page posting, the query string can easily transport the same information from page to page It has some limitations, however: Information is limited to simple strings, which must contain URL-legal characters.

The JDBC Template is the central class in the JDBC package. It provides various overload methods to query and update a database and execute standard SQL. As with the standard JDBC, it requires a data source to work with, which can be injected from the XML configuration file as in the previous example. The Spring JDBC framework provides a number of interfaces to handle the callback. For example, different versions of the query method allow you to query for simple types (String, long, int), maps, and domain objects.

The Environment type defines members other than those shown in the previous example. Table 3-1 documents some additional properties of interest; however, be sure to check out the .NET Framework 4.0 SDK documentation for full details. Table 3-1. Select Properties of System.Environment

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Information is clearly visible to the user and to anyone else who cares to eavesdrop on the Internet The enterprising user might decide to modify the query string and supply new values, which your program won t expect and can t protect against Many browsers impose a limit on the length of a URL (usually from 1 to 2 KB) For that reason, you can t place a large amount of information in the query string and still be assured of compatibility with most browsers Adding information to the query string is still a useful technique It s particularly well suited in database applications where you present the user with a list of items corresponding to records in a database, like products The user can then select an item and be forwarded to another page with detailed information about the selected item.

Gets or sets the exit code for the application. Gets the name of the current machine. Gets the newline symbol for the current environment. Gets the current stack trace information for the application. Returns the full path to the system directory. Returns the name of the user that started this application.

One easy way to implement this design is to have the first page send the item ID to the second page The second page then looks that item up in the database and displays the detailed information You ll notice this technique in e-commerce sites such as Amazoncom..

Almost all of the example applications created over the course of the initial chapters of this book make extensive use of the System.Console class. While it is true that a console user interface (CUI) is not as enticing as a graphical user interface (GUI) or web-application, restricting the early examples to console programs will allow us to keep focused on the syntax of C# and the core aspects of the .NET platform, rather than dealing with the complexities of building GUIs or web sites. As its name implies, the Console class encapsulates input, output, and error-stream manipulations for console-based applications. Table 3-2 lists some (but definitely not all) members of interest. Table 3-2. Select Members of System.Console

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