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You need to select a local or remote SQL Server instance that will host the Reporting Services database. You can use an existing Report Server database or provide a unique name if you want to create a Report Server database. You also need to specify an account that Reporting Services will use to connect to this database at run time. The default account is the service account used to run the

You write the rest of the page as usual, paying close attention to accessing the specified Cache key. The reason for this is that because of the dependency, the key could be null. Here s an example:

protected String Display() { var o = Cache[CacheKeyName]; return o "[No data available--dependency broken]"; }

TABLe 1-17

The XmlDataCacheDependency object allows you to control changes that occur on a file and decide which are relevant and might require you to invalidate the cache. The sample dependency uses XPath expressions to identify a subset of nodes to monitor for changes. Note I decided to implement polling in this sample custom dependency because polling is a

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pretty common, often mandatory, approach for custom dependencies. However, in this particular case polling is not the best option. You could set a FileSystemWatcher object and watch for changes to the XML file. When a change is detected, you execute the XPath expression to see whether the change is relevant for the dependency. Using an asynchronous notifier, if one is available, results in much better performance.

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Many ASP.NET applications query some data out of a database, cache it, and then manage to serve a report to the user. Binding the report to the data in the cache will both reduce the time required to load each report and minimize traffic to and from the database. What s the problem, then With a report built from the cache, if the data displayed is modified in the database, users will get an out-of-date report. If updates occur at a known or predictable rate, you can set an appropriate duration for the cached data so that the report gets automatically refreshed at regular intervals. However, this contrivance just doesn t work if serving live data is critical for the application or if changes occur rarely and, worse yet, randomly. In the latter case, whatever duration you set might hit the application in one way or the other. A too-long duration creates the risk of serving outdated reports to end users which, in some cases, could undermine the business; a too-short duration burdens the application with unnecessary queries. A database dependency is a special case of custom dependency that consists of the automatic invalidation of some cached data when the contents of the source database table changes. In ASP.NET, you find an ad hoc class SqlCacheDependency that inherits CacheDependency and supports dependencies on SQL Server tables. More precisely, the class is compatible with SQL Server 2005 and later.

ReportServer Windows service, but you can also specify a domain user account or a SQL Server login to conform to existing security practices for your SQL Server instance. In this procedure, you will specify the SQL Server instance and the name of the database used by the Report Server.

All other attributes relate to the cookie, if one gets created. You can set its name the default name is .ASPXANONYMOUS as well as its path, domain, protection, expiration, and timeout. You can also indicate whether Secure Sockets Layer (SSL) should be used to transmit the cookie.

The <authentication> section allows you to configure a Web site for various types of user authentication, including Forms authentication as well as Passport and IIS-driven authentication. This section has two mutually exclusive subsections <forms> and <passport> and the mode attribute to control the authentication mode requested by an application. Allowable values for the mode attribute are shown in Table 3-6.

483 596 598 599 591 593 594 604 605

TABLE 3-6

Makes use of a custom form to collect logon information. Exploits the authentication services of Microsoft Passport (now LiveID). In ASP.NET 4, classes dealing with Passport authentication are marked obsolete. Indicates ASP.NET should not enforce any type of authentication, which means only anonymous users can connect or the application itself provides a built-in mechanism. Exploits any authentication services of IIS basic, digest, NTLM\Kerberos, or certificates. This is the default mode.

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