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Consider a scenario in which a coworker wrote a simple Windows Forms application to view text files. However, users complain that it is very temperamental. If the user mistypes the filename or if the file is not available for any reason, the application fails with an unhandled exception error. You must add exception handling to the application to display friendly error messages to users if a file is not available. 1. Copy the 01\Lesson2-ViewFile folder from the companion CD to your hard disk, and open either the C# version or the Visual Basic .NET version of the ViewFile project. 2. Exceptions occur when users attempt to view a file. Therefore, edit the code that runs for the showButton.Click event. Add code to catch any type of exception that occurs, and display the error in a dialog box to the user. If an exception occurs after the TextReader object is initialized, you should close it whether or not an exception occurs. You will need two nested Try blocks: one to catch exceptions during the TextReader initialization, and a second one to catch exceptions when the file is read. The following code sample demonstrates this:

To remove a message, select it from the list, right-click on it, and then select Remove Messages (with NDR) or Remove Messages (without NDR). Click OK to remove the message. If you want to, you can select several messages and remove them with a single operation. To remove all messages from a particular queue, click the Queues tab, select a queue, right-click the queue, and select Remove Messages (with NDR) or Remove Messages (without NDR). Click Yes to clear the confirmation dialog box and delete the queue.

Before diving headlong into a demonstration on creating an instance of a remote object in a client application, you must gain some background knowledge. Under standing the terminology introduced in the following sections is vital to mastering the client side of .NET remoting.

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Further Reading . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-3

In addition to enabling remote control settings, an administrator must have permissions to establish remote control over the terminal server connection. Using the Permissions

C. Correct: Specifying file for the protocol in the URL instructs Internet Explorer to access the file using shared folders. This URL is exactly equivalent to \\server.margiestravel.com\accounting\expense-reports.xls. D. Incorrect: As with answer B, the protocol is incorrect. Additionally, the hyphen in the file name has been replaced with %20, a special sequence used in URLs to represent a space character, not a hyphen.

Making changes on the File Locations tab requires more than selecting or clearing a check box or making a selection from a drop-down list. To modify the location of saved files, click Modify. In the Modify Location dialog box, browse to the new loca tion and click OK. Note that you can create a new folder in the desired location by selecting the Create New Folder icon in the Modify Location dialog box. A user might want to change the default location of saved files to make backing up documents eas ier or to make locating AutoRecover files more intuitive.

1. Correct Answer: C A. Incorrect: If you selected this answer because the throttling configuration for maxConcurrentCalls is 15, this is not the limiting parameter for the throttling. B. Incorrect: If you selected this answer because the throttling configuration for maxConcurrentInstances is 10, this is not the limiting parameter for the throttling. C. Correct: Given the settings, the limiting parameter is the number of concurrent instances allowed. With the default values, operation calls are instanced on a PerCall basis, so with five simultaneous requests, that would mean five instances of the service class are created. This is the configured throttling value. D. Incorrect: Throttling limits can apply to incoming requests. 2. Correct Answer: D A. Incorrect: By setting the IsInitializing property to true, you can ensure that a method must be called before others in the service. B. Incorrect: By setting the IsTerminating property to true, you can ensure that a method must be called after all the others in the service and that no methods can be called after it.

Manage a Web Server . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-54

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