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The CustomWorkerArgs class simply holds an integer representing an index (so we can easily access the button/text block associated with BackgroundWorker) and an integer for sleepTime (the total time the worker method should take to execute) Using a class like this is how you can communicate as much information as needed to BackgroundWorker class CustomWorkerArgs { public int index; public int sleepTime; } Since the various event handlers for BackgroundWorker include a sender (the BackgroundWorker instance), you can hold a reference to this worker at the class level and compare the instances instead of passing the index via CustomWorkerArgs In fact, in one case (when the worker is cancelled or throws an exception), this is mandated However, this information is included in the CustomWorkerArgs class in order to show where information can be accessed and used in the BackgroundWorker s event handlers.

Verifies the presence of an e-mail address Expands an e-mail address and shows a list of all the mailboxes or users who will receive messages when e-mail is sent to this address Allows dial-up hosts to retrieve only the mail destined for their domain

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The primary purpose of the Workflow Designer is to build new workflows from preexisting activities According to Microsoft, the primary audience of the Workflow Designer tool is nonIT department power users While I understand this, I feel that Microsoft is selling the tool short This tool, like any other, is used to accomplish a certain task Although the tasks handled by the Workflow Designer are somewhat limited in this version (for example, no support for state machines and no arbitrary branching, or goto), there are still a wide range of scenarios at which it excels Look for the capabilities of this tool to be expanded in future versions So, limitations aside, the tool handles certain tasks well and should be used by anyone who needs to accomplish those tasks.

You can keep an array of BackgroundWorker instances at the class level, along with an array of Buttons and an array of TextBlocks The Button, in XAML, stores the appropriate index in the Tag attribute A single Button event handler is used to start BackgroundWorker private void buttonTask_Click(object sender, RoutedEventArgs e) { // Tag used to get index for button/text blocks int index = ConvertToInt32(((Button)sender)Tag); if (workers[index] != null) { resultBoxes[index]Text = "Cancelling.."; workers[index]CancelAsync(); bwButtons[index]Content = "Start"; } else { BackgroundWorker worker = new BackgroundWorker(); workerWorkerReportsProgress = true; workerWorkerSupportsCancellation = true; workerProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged); workerRunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted);.

VRFY, for example, is a way for a remote SMTP server to verify that a user or e-mail addresses exists and is valid at another SMTP server. For example, if you Telnet to a Sendmail server with VRFY enabled, you should see something like Listing 7-14. Listing 7-14. Using the VRFY Command [john@kitten]$ telnet puppy.yourdomain.com 25 Trying 192.168.0.1... Connected to puppy.yourdomain.com. Escape character is '^]'. 220 puppy.yourdomain.com ESMTP VRFY root 250 2.1.5 root@puppy.yourdomain.com VRFY jim 550 5.1.1 jim... User unknown This is a Sendmail server, and I have Telneted into it and asked it to check for the presence of some local users. First, I try to VRFY root. Sendmail gives SMTP response code 250 and provides root s e-mail address. In the second attempt I try to VRFY jim. Sendmail reports that jim is an unknown user and returns response code 550. With the VRFY option enabled only attackers and the harvesters of e-mail addresses for spam purposes are able to do two things confirm the presences of a username on your system or confirm that an e-mail address will receive mail and is thus of some value as a target for spam. You can control most of the SMTP command options in Sendmail using this option: define(`confPRIVACY_FLAGS', `flags').

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