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A golden rule of Web security claims that all user input is evil and should always be filtered and sanitized before use. The @Page directive has an attribute ValidateRequest that automatically blocks postbacks that contain potentially dangerous data. This feature is not the silver bullet of Web input security, but it helps detect possible problems. From a general security perspective, you re better off replacing the automatic input validation with a strong, application-specific validation layer. The automatic input validation feature ValidateRequest is enabled by default and implemented via a call to the HttpRequest s ValidationInput method. ValidateInput can be called by your code if the validation feature is not enabled. Request validation works by checking all input data against a hard-coded list of potentially dangerous data. The contents of the collections QueryString, Form, and Cookies are checked during request validation.

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The URL access parameters that control Report Server use the same syntax that you use for parameters affecting the HTML Viewer, except that &rc: is replaced by &rs:. You can potentially improve the performance of a request if you use the Command parameter. Because the value that you supply for Command describes what you re asking for, Report Server does not have to look up the item type and determine the response. When you want to view a report, use &rs:Command=Render. If you re interested in seeing a list of items contained in a specified folder, use &rs:Command=ListChildren. To view the XML representation of a data source, use GetDataSourceContents. Report Server s response to &rs:Command=GetResourceContents depends on whether the item can be viewed in the browser, and whether Report Server needs to prompt you to open or save the file. The complete set of URL access parameters that controls Report Server is shown in the following table:

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.

You need to add relationships between the Geography dimension and the Reseller Sales and Internet Sales measure groups . 6. Select the cell at the intersection of the Geography dimension and the Reseller Sales measure group and click the ellipsis button ( ) that appears . 7. In the Define Relationship dialog box, select Referenced from the Select Relationship Type list .

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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

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