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ilverlight code isn t permitted to write to arbitrary locations on the file system (or read from them). Obviously, if this ability were possible, it would break the web browser s secure sandbox model. However, Silverlight applications that need to store data permanently still have an option. They can use a feature called isolated storage. Isolated storage gives you access to a small segment of hard disk space, with certain limitations. For instance, you won t know exactly where your files are being stored. You also won t be able to read the files left by another Silverlight application or recorded for another user. In essence, isolated storage provides carefully restricted, tamperproof file access for applications that need to store permanent information on the local computer usually so this information can be retrieved the next time the user runs the application. In this chapter, you ll learn how to create files in isolated storage and write and read data. You ll see how to store miscellaneous data, application settings, and entire objects. You ll also learn how to request more isolated storage space for your application, and you ll consider one alternative that does give you the ability to read the data from an ordinary file that s not in isolated storage provided the user explicitly allows it.

The Decomposition Tree feature is a very powerful analytical tool, with an interface designed to be simple and intuitive to an untrained user (see Figure 6 18). The Decomposition Tree leverages the dimensions already built into the solution to drive the analysis. It allows users to do complex analysis without involving a developer. However, because of the large number of members that a dimension might contain, it can become a performance drain on the system.

Figure 5-3. The managed Service Broker client built with the managed assembly If you take a look into the TargetQueue in the SQL Server database (with a T-SQL statement such as SELECT * FROM TargetQueue), you ll see that the client application sent the message successfully (see Figure 5-4).

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Isolated storage provides a virtual file system that lets you write data to a small, user-specific and application-specific slot of space. The actual location on the hard drive is obfuscated (so there s no way to know exactly where the data will be written beforehand), and the default space limit is a mere 1MB (although you can request that the user grant you more). Essentially, isolated storage is the Silverlight equivalent of persistent cookies in an ordinary web page. It allows small bits of information to be stored in a dedicated location that has specific controls in place to prevent malicious attacks (such as code that attempts to fill the hard drive or replace a system file).

Figure 6 18 Decomposition Tree Each item listed in a vertical column of the decomposition tree is counted against this limit. Note that this limit applies to only one column of items as highlighted in Figure 6 18. The total number of items in all columns may well exceed this value. This limit should not be set higher than is needed for the users to perform the analysis required.

With isolated storage, a unique storage location is created for every combination of user and application. In other words, the same computer could have multiple isolated storage locations for the same location, assuming each one is for a different user. Similarly, the same user could have multiple isolated storage locations, one for each Silverlight application. Isolated storage isn t affected by browser, so a Windows user switching from Internet Explorer to Firefox would get the same isolated storage location in both browsers.

Figure 5-4. The sent message on the TargetQueue After the client application sends the message successfully, you can implement an activated stored procedure that processes the message and sends a response back to the client. Have a look at Listing 5-9. Listing 5-9. Message-Processing Stored Procedure for the TargetQueue CREATE PROCEDURE ProcessRequestMessages AS DECLARE @ch UNIQUEIDENTIFIER DECLARE @messagetypename NVARCHAR(256) DECLARE @messagebody XML DECLARE @responsemessage XML; WHILE (1=1) BEGIN BEGIN TRANSACTION WAITFOR ( RECEIVE TOP (1) @ch = conversation_handle, @messagetypename = message_type_name, @messagebody = CAST(message_body AS XML) FROM TargetQueue ), TIMEOUT 1000 IF (@@ROWCOUNT = 0) BEGIN ROLLBACK TRANSACTION BREAK END

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