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PurchaseOrderReceivedCheck. You have two choices of how the user will access the application: either online only or offline. If the application is available offline, it will be installed to the workstation, and a shortcut will be provided in the Start menu. You can also control the version of the publication. Each version must be unique for the update to be installed. You can configure how updates are received by clicking the Updates button. The Application Updates dialog appears, as in Figure 9-2.

You can crop an image using the Clip property of an image. Within the Clip property, you can then specify a geometry, and WPF will crop the image according to that geometry. So, if you use an image and set its clip to a closed path, you will crop the image with the contents of the shape defined by that path. Listing 7-5 shows an example of an image and a PathGeometry that defines a clipping triangle.

The preceding example illustrates that different types of web sites are going to have different security goals. In the case of a political web site, the integrity of the web site content is the most significant concern, while in the case of a financial web site, integrity and confidentiality of customer data are both of high importance. Military web sites have still different security sensitivities. If a military web site is defaced, it might simply be embarrassing for them. Infiltration of a military web site, in which confidential or classified data is acquired by the attacker, however, could be a threat to national security.

Phishing is an attack in which an attacker (in this case, a phisher) sets up a spoofed web site that looks similar to a legitimate web site The attacker then attempts to lure victims to the spoofed web site and enter their login credentials, such as their usernames and passwords In a phishing attack, attackers typically lure users to the spoofed web site by sending them e-mails suggesting that there is some problem with their account, and that the user should click a link within the e-mail to verify their account information The link included in the e-mail, of course, is to the attacker s web site, not the legitimate site When unsuspecting users click the link, they arrive at the spoofed site and enter their login credentials.

Listing 7-5. Clipping Triangle <Grid> <StackPanel> <Image Source="FishTn.jpg" Height="256.84375" Width="392"> <Image.Clip> <PathGeometry> <PathGeometry.Figures> <PathFigure StartPoint="10,100" IsClosed="True"> <PolyLineSegment> <PolyLineSegment.Points> <Point X="200" Y="100" /> <Point X="200" Y="200" /> </PolyLineSegment.Points> </PolyLineSegment> </PathFigure> </PathGeometry.Figures> </PathGeometry> </Image.Clip> </Image> </StackPanel> </Grid> Figure 7-19 shows the results of this. The full image is at the top of the StackPanel, and the cropped pixels appear at the bottom.

Figure 9-2. Application Updates window The first choice you must make is whether updates are even to be made available. You can use ClickOnce installation as an easier method of application installation without even using the update features by unchecking the check box The application should check for updates. Obviously, to allow the application to get updates, make sure this box is checked. Once you ve decided to allow updates for the application, you must choose when the application checks for those updates. You can choose After the application starts or Before the application starts. If you choose After the application starts, the checking and downloading of the update is done in the background while the application works. The next time the user executes the application, the update will be available. If you choose Before the application starts, the checking occurs when the user executes the application. The update is then installed prior to the application executing, and the latest version is shown to the user. You can also specify that all instances of this application must use a specific version of the application. This is a way to force the updates to be installed. For this application, leave the default, Before the application starts and click OK.

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