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The trusted CAs list is automatically updated through the update mechanisms for your selected operating system. In Windows Vista and Windows Server 2008, this update is controlled through a Group Policy setting that is turned on by default. In earlier Windows operating systems, the update of Trusted Root Certificates was a component of Windows, accessed through Control Panel.

' VB Sub sc_SendCompleted(ByVal sender As Object, ByVal e As AsyncCompletedEventArgs) If e.Cancelled Then Console.WriteLine("Message cancelled") Else If Not (e.Error Is Nothing) Then Console.WriteLine("Error: " + e.Error.ToString) Else Console.WriteLine("Message sent") End If End If End Sub // C# void sc_SendCompleted(object sender, AsyncCompletedEventArgs e) { if (e.Cancelled) Console.WriteLine("Message cancelled"); else if (e.Error != null) Console.WriteLine("Error: " + e.Error.ToString()); else Console.WriteLine("Message sent"); }

Unlike in other chapters, performing the practices in the first lesson of this chapter requires that you have access to a Tablet PC that has Windows Home Premium, Business, Enterprise, or Ultimate installed. Performing the practices in Lesson 2 require only that you have access to a computer running Windows Vista.

For more information on Windows Vista certificate support, go to http://technet2.microsoft.com /WindowsVista/en/library/5b350eae-8b08-4f2c-a09e-a17b1c93f3d01033.mspx mfr=true. For a list of Trusted Root Certificates in Windows, go to http://support.microsoft.com/kb/931125.

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And the following code creates the SmtpClient object, adds the event handler, calls the asynchronous send, and then immediately cancels the send. Naturally, in real code, you would wait for the user to initiate a cancellation. This code assumes a MailMessage object named mm already exists.

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When you issue your own certificates certificates that do not originate from external CAs you must include your own organization as a trusted CA on the computers of the people who will be using these certificates. You can do this when you work with the users of your own organization because you control their computers, but when the users are people whose computers you do not control, this becomes problematic. Asking them to accept your certificate is like asking them to trust you when they don t know you. This is one reason PKI architectures are built the way they are. Essentially, each member of a public key infrastructure is chained together in a hierarchy that ends at the topmost CA. This

' VB SmtpClient sc = new SmtpClient("server_name"); ' Add the event handler AddHandler sc.SendCompleted, AddressOf sc_SendCompleted ' Send the message asynchronously sc.SendAsync(mm, Nothing) ' Cancel the send sc.SendAsyncCancel()

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// C# sc = new SmtpClient("server_name"); // Add the event handler sc.SendCompleted += new SendCompletedEventHandler(sc_SendCompleted); // Send the message asynchronously sc.SendAsync(mm, null); // Cancel the send sc.SendAsyncCancel();

Orin Thomas One of the reasons I learned to type is that my teachers found my handwriting incomprehensible. The fact that my Windows Vista Tablet PC has quickly come to terms with my messy scrawl is to me one of the most amazing things about Windows Vista. Although I type very fast, I enjoy using the Tablet PC for taking notes when I m attempting to nut out a problem. The interface allows you to be nonlinear in a way that typing text directly into Microsoft Word does not. The Tablet PC is a wonderful replacement for the traditional notepad and, even though I ve only had one for a couple of months, it is hard for me to imagine my life without it.

SmtpClient.SendAsync accepts two parameters: the MailMessage object to be sent and a generic Object. You can specify Null or any other object for the second parameter; it is strictly for your own use. The .NET Framework simply passes it to the event handler. If you were sending multiple messages asynchronously, you could use the second parameter to keep track of which message generated the event.

CA is ultimately responsible for each of the certificates included in the chain. For example, if you obtain a certificate from your organization and your organization obtained its master certificate from a trusted commercial CA (as shown in Figure 15-3), your certificate will automatically be trusted because each browser already trusts the commercial CA. As you can imagine, this external CA must use a stringent validation program; otherwise, that certificate provider won t be in business for long.

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