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With Windows Vista, the Tablet PC experience has reached a new level. Tablet PC functionality is built into most editions of Windows Vista, and it is not necessar to install a separate edition of the operating system, as it was with Microsoft Windows XP, to take advantage of these remarkable devices. Tablet PCs are mobile PCs into which you use a pen device to enter data. Although entering text with a pen rather than a keyboard might seem quaint, the ability to write and draw makes the Tablet PC an excellent note-taking and brainstorming device. When used on battery power, the Tablet PC becomes like the ultimate clipboard, used by a variety of people, from doctors in hospital wards to students in lecture theatres. The downside of that portability is the limited capacity of the battery. Anyone who has used a battery-powered laptop knows the stress of being in the middle of writing an important document with notifications popping up informing you that the computer is almost out of power and that you need to shut it down right now or risk losing everything. Power settings allow mobile computers to make the most out of a limited battery supply. You can configure a mobile computer to display all bells and whistles when connected to an external power supply and then have it shift into a mode where it conserves every last bit of energy to extend your working time when external power is not available.

To specify the username and password, create an instance of the System.Net.NetworkCredential class and use it to define SmtpClient.Credentials. The following example shows hard-coded credentials; however, you should always prompt the user for credentials:

Figure 15-1 Active Directory Certificate Services can provide services both inside and outside your network

' VB Dim client As SmtpClient = New SmtpClient("smtp.contoso.com") client.Credentials = New NetworkCredential("user", "password") // C# SmtpClient client = new SmtpClient("smtp.contoso.com"); client.Credentials = new NetworkCredential("user", "password");

Exam objectives in this chapter:

For example, when you go to a Web site using the Secure Hypertext Transfer Protocol (HTTPS) that contains an SSL certificate, this certificate proves to you that you really are where you intend to be. When you verify the certificate, you see that it includes the server name, the organization name, and the issuing certificate authority. The certificate works with your browser

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Another important security-related property is SmtpClient.EnableSsl. When you set this value to True, the runtime will encrypt the SMTP communications using SSL. Not all SMTP servers support SSL, but you should always enable this property if support is available.

15

Sending an e-mail message often takes less than a second. Other times, however, the SMTP server might be slow or completely unresponsive, causing your application to wait for the value specified by SmtpClient.Timeout. While your application waits for

Lessons in this chapter:

15

because browsers such as Microsoft Internet Explorer or Firefox already include a list of trusted commercial CAs that manage the certification process as a business. (See Figure 15-2.)

Lesson 1: Configuring Tablet PC Software. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 705 Lesson 2: Configuring Power Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 723

the SMTP server (up to 100 seconds by default), your application will be unresponsive and the cursor will change to an hourglass. Users don t have much patience for unresponsive applications, and there is a good chance they will terminate your application. Fortunately, you can send e-mails asynchronously to enable your application to respond to the user while you wait for the message to be sent. You can even give the user the opportunity to cancel the e-mail transmission. To send a message asynchronously, perform these tasks: 1. Create a method to respond to the SmtpClient.SendCompleted event. This method needs to determine whether the transmission was successful, unsuccessful, or cancelled. 2. Add your event handler to SmtpClient.SendCompleted. 3. Call SmtpClient.SendAsync. 4. Optionally, provide the user the opportunity to cancel the e-mail by calling the SmtpClient.SendAsyncCancel method. For example, the following method responds to an SmtpClient.SendCompleted event (it requires the System.ComponentModel namespace):

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