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To send a message, you begin by creating an instance of the LocalMessageSender class. It s usually convenient to create a single instance, and keep it around as a member variable in your page: private LocalMessageSender messageSender = new LocalMessageSender("EavesdropperReceiver"); When you create the LocalMessageSender object, you need to supply a receiver name. This is the name that the receiver will use to listen for messages. The actual name isn t important, but the sender and receiver must use the same name to communicate. Ordinarily, local connections only work with applications that are running from the same web domain. However, you have the option of specifying a different domain as a second constructor argument:

EXEC sys.sp_configure 'query governor cost limit' ,1 GO RECONFIGURE GO We know this option sounds great, and it can definitely be a method for improving performance. However, we encourage you to consider the consequences of preventing certain processes from running against your server. Believe me, we re on your side we would love to make developers write better code, and preventing a process from running is one way to force developers to write that code better. Unfortunately, your boss s boss, who really needs the results from a long-running query, may not be as understanding. Make sure you set a query vides much more flexibility when dealing with resource-intensive queries.

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private LocalMessageSender messageSender = new LocalMessageSender("EavesdropperReceiver", "anotherWebDomain.com"); Alternatively, you can use the syntax shown here to create a global message sender: private LocalMessageSender messageSender = new LocalMessageSender("EavesdropperReceiver", LocalMessageSender.Global); Now, any application from any domain can receive the messages you send. If you use this approach, it s a good idea to take extra care to choose a receiver name that s likely to be unique. Don t use a common naming shorthand like receiver , MessageReceiver , and so on, as other Silverlight applications use the same names. Once you ve created the LocalMessageSender, sending a message is easy. You simply need to call SendAsync() method and pass in your message as a string. Optionally, you can handle the LocalMessageSender.Completed event, which fires when the message has been sent (but won t tell you if it s been received). Here s the code used to send messages as the user types, as shown in the application in Figure 20-10: private void txt_KeyUp(object sender, KeyEventArgs e) { messageSender.SendAsync(txt.Text); }

As with test scenarios, you will probably find it more efficient to enter test cases using a datasheet view. The current view, however, does not include all the columns that you ll need to enter. To accommodate data entry via a datasheet, you ll now create a new view for that purpose.

xp_cmdshell is a configurable option that allows you to disable or enable the use of the extended stored procedure xp_cmdshell. xp_cmdshell is used to execute command-line statements from within the database engine. If you need it though, you can enable xp_cmdshell by executing the following code: EXEC sys.sp_configure 'xp_cmdshell' ,1 GO RECONFIGURE GO Be careful! By default, the xp_cmdshell stored procedure is disabled during install and should remain disabled if it is not required by the application. Think about it once a user gains access to your system, he has the power to cause all sorts of havoc on your server.

As you probably expect, you receive messages by creating a LocalMessageReceiver object. When you do, you must specify the same receiver name that was used when creating the LocalMessageSender: private LocalMessageReceiver receiver = new LocalMessageReceiver("EavesdropperReceiver"); This LocalMessageReceiver will receive message from Silveright applications that are running from the same domain. Alternatively, you can pass in an array that specifies one or more domains that you want to allow. Here s an example that listens to messages sent to the Eavesdropper receiver, by applications running on anotherWebDomain.com: LocalMessageReceiver messageReceiver = new LocalMessageReceiver( "Eavesdropper", ReceiverNameScope.Domain, new string[]{"anotherWebDomain.com"}); Finally, you can choose to accept messages from all domains with this syntax: LocalMessageReceiver messageReceiver = new LocalMessageReceiver( "Eavesdropper", ReceiverNameScope.Global, LocalMessageReceiver.AnyDomain); Once you ve created the LocalMessageReceiver, you need to attach an event handler to the MessageReceived event, and call the Listen() method to start listening. private void Page_Loaded(object sender, RoutedEventArgs e) { receiver.MessageReceived += receiver_MessageReceived; receiver.Listen(); }

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