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Silverlight supports stream sockets, which are sockets that use TCP communication. TCP is a connection-oriented protocol that has built-in flow control, error correction, and sequencing. Thanks to these features, you won t need to worry about resolving any one of the numerous possible network problems that could occur as information is segmented into packets, and then transported and reassembled in its proper sequence at another computer. Instead, you can simply write data to a stream on one side of the connection, and read it from the stream on the other side. To create a TCP connection, your application must perform a three-stage handshaking process: 1. First, the server must enter listening mode by performing a passive open. At this point, the server will be idle, waiting for an incoming request. 2. A client can then use the IP address and port number to perform an active open. The server will respond with an acknowledgment message in a predetermined format that incorporates the client sequence number. 3. Finally, the client will respond to the acknowledgment. At this point, the connection is ready to transmit data in either direction.

Just about any kind of business will benefit from having appropriate, accurate, and up-to-date information in order to make key decisions. The question is, how do you get this information when the data is tightly coupled with business and is in use. In general, you need to think about questions such as: How can you drill down into tons of information, aggregate that information, and perform mathematical calculations to analyze it How can you use such information to understand what s happened in the past as well as what s happening now, and thereby build better solutions for future

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In the following sections, you ll use Silverlight to build a socket client and .NET to build a socket server. The result is a simple chat application that allows multiple users to log in at the same time and send messages back and forth. Figure 17-8 shows two of these instances of the client engaged in conversation.

If the application doesn t require an exact record of all sent and received messages while the conversation is active, maintaining state in a state table may improve performance Also, remember that when the conversation ends, the retained messages are removed from the queue, so if you re using retention for auditing purposes, you must be sure to copy the messages to another table before ending the conversation To enable RETENTION on a queue, you must specify the RETENTION clause when you create or alter a queue (see Listing 6-30) Listing 6-30 Enabling RETENTION on a Queue CREATE QUEUE OrderQueue WITH STATUS = ON, RETENTION = ON.

Figure 17-8. A socket-based chat client Implementing this solution takes a fair bit of networking code. However, the result is well worth it, and takes you far beyond the bounds of ordinary HTML pages.

Here are some typical and more specific business-related questions you might have to answer. What are the newly created accounts this month Which new users joined this quarter Which accounts have been removed this year How many vehicles have we sold this year and what s the new inventory How many issues have been addressed this week in the command center What is the failure rate of products in this unit What are the all-time top 10 stocks Can you rank these employees in terms of monthly sales Is it possible to run statistical analysis on existing data

Unlike data outside of services, data on the inside is private to the service. In fact, it is only loosely correlated to the data on the outside. Data on the inside is always encapsulated by service code, so the only way of accessing it is through the business logic of the service. Data on the inside comprises the tables where you store your transactional data. Just think back to the CreditCardTransaction table from 6, where you implemented the CreditCardService.

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