birt ean 13

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Dim source As String = a1 = a1 & e2"

Summary

Dim mc As MatchCollection = re.Matches(source)

In this chapter, we covered some basic objects that are the foundation of ASP.NET programming: Server, Response, Request, and others. An ASP.NET application is represented by an instance of the HttpApplication class properly configured by the contents of the global.asax file. And both the HttpApplication class and the global.asax file found their space in this chapter too. While discussing the interface of the objects that generate the context of an HTTP request, we reviewed in detail some specific programming issues, such as server-side page redirection and the setup of response filters. In the next chapter, we ll discuss an important topic related to Web applications and ASP.NET state management. Fundamentally, Web applications are stateless, but ASP.NET provides various mechanisms for maintaining application state and caching pages. In ASP.NET 4, all intrinsic objects (except Cache) have been derived from a new base class to give developers better chances to be able to write testable Web pages.

17

You can also pass to the Matches method a second argument, which is interpreted as the index where the search begins. The MatchCollection object contains individual Match objects, which expose properties such as Value (the matching string that was found), Index (the position of the matching string in the source string), and Length (the length of the matching string, which is use ful when the regular expression can match strings of different lengths):

In the beginner s mind there are many possibilities. In the expert s mind there are few. Shunryu Suzuki All real-world applications of any shape and form need to maintain their own state to serve users requests. ASP.NET applications are no exception. However, unlike other types of applications, they need special system-level tools to achieve the result. The reason for this peculiarity lies in the stateless nature of the underlying protocol that Web applications still rely upon. As long as HTTP remains the transportation protocol for the Web, all applications will run into the same problem figuring out the most effective way to persist state information. Application state is a sort of blank container that each application and programmer can fill with whatever piece of information makes sense to persist: from user preferences to global settings, from worker data to hit counters, from lookup tables to shopping carts. This extremely variegated mess of data can be organized and accessed according to a number of different usage patterns. Typically, all the information contributing to the application state is distributed in various layers, each with its own settings for visibility, programmability, and lifetime. ASP.NET provides state management facilities at four levels: application, session, page, and request. Each level has its own special container object, which is a topic we ll cover in this chapter. In this chapter, we ll explore the HttpApplicationState, HttpSessionState, and ViewState objects, which provide for application, session, and page state maintenance, respectively. In the next chapter, we ll dive into the Cache object. Note In this chapter, we won t discuss cookies in detail, but cookies are definitely useful for

...(Continuing the previous example)... For Each m As Match In mc Display text and position of this match. Console.WriteLine( {0} at position {1} , m.Value, m.Index) Next

storing small amounts of information on the client. The information is sent with the request to the server and can be manipulated and re-sent through the response. The cookie is a text-based structure with simple key/value pairs, and it consumes no resources on the server. In e-commerce applications, for example, cookies are the preferred way of storing user preferences. In addition, cookies have a configurable expiration policy. The negatives for cookies are their limited size (browser-dependent, but seldom greater than 8 KB) and the fact that the user can disable them.

The preceding code displays these lines in the console window:

Important When supplying parameter values in a URL, you need to know the valid values. In this example, 2 is the value that the Bike label represents. If you try to use &Category=Bike to set the report parameter value in this URL, an error will result. 2

TABLE 17-1