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The My.Forms collection allows you to reference any form within it without having to say My.Forms first. The members of the My.Forms collection represent default instances of each form in the project. That s all the code we need for now, but if you run the program, it will still show only the AboutProgram form. That s because the AboutProgram form is set as the startup form. To alter this, open the project s properties window, select the Application tab, and set the Startup form field to MainForm. Since the AboutProgram form is now being shown as a dialog form (through a call to its ShowDialog method), its behavior is somewhat different. Each form includes a DialogResult property whose value is returned by the ShowDialog method when the form closes. Each button on your form can be configured to automatically set this property and close the form. The Close button on the AboutProgram form does just that; its own DialogResult property is set to Cancel, which is assigned to the form s DialogResult property when the user clicks the Close button. As a side effect, anytime a value (other than None) gets assigned to the form s DialogResult property, the form closes. The upshot of that drawn-out paragraph is that you can now delete the event handler for the Close button s Click event, and the button will still close the form. Delete the ActClose_Click procedure from the AboutProgram s source code, run the program, and see what happens. The Close button still closes the form, even without the event handler.

The Scatterplot 2 worksheet in the 1103_ScatterXY.xlsx workbook contains a half-finished solution . As yet, no one has decided whether this chart will be printed only or also will be used for presentation purposes .

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If another user has files encrypted with EFS, do not create a password for that user; instead, show the user how to create a password for their own account . Similarly, do not remove or change another user s password unless the user has forgotten the password and has absolutely no other way to access the account . (For more information, see the following section, Recovering from a Lost Password .) If you create, change, or remove another user s password, that user loses all personal certificates and stored passwords for websites and network resources . Without the personal certificates, the user loses access to all of his or her encrypted files and all e-mail messages encrypted with the user s private key . Windows deletes the certificates and passwords to prevent the administrator who makes a password change from gaining access to them but this security comes at a cost!

Table 7.2 We can create a graphical orientation gauge in just a few minutes in Dashcode. Description Select File > New Project. Choose a Custom project. Drag a gauge from the Parts library to the top center of your Dashcode canvas. Pop up an inspector window and click on the Attributes tab. In the Values section, change the range to go from 0 to 359, to allow the full range of values. Change the threshold to 0 and warning and critical to 360, to make sure the gauge always remains green. In the Geometry section, change the angles to go from 0 to 359 to match the gauge up with our possible orientation directions. Change the pointer reach to 120% to help it stand out more. In the main window, click the Application Attributes button in the Navigator sidebar. Change the Title to Orientation Gauge. Change the viewport to Adjust page width to fit, to keep your gauge from resizing. Open the Metrics inspector for the content object. Change resizing so that the left and right springs are outside of the subwindow, rather than inside. Open a source code panel using the View button. Drag Set Gauge Value from the Code library to the source code panel. Adjust it appropriately to set the gauge s value on startup and when the orientation changes. Design and input a home screen icon using the Home Screen Icon button in the navigator sidebar. Release your new program.

TABLE 11-1

We re now going to cheat somewhat, and rather than getting our data from a web service or from a database, we re going to put it right into our resources. The data will consist of a generic list of ImageURL objects. You haven t heard of these types of objects before, because you re going to create the class right now. Right-click on the project file in the Solution Explorer and choose Add Class. When the Add New Item dialog box appears, the Class item will be selected automatically. Leave it selected, and give the class file a name of PhotoCatalog.cs. Visual Studio will automatically open a new class file for you. Add the code in Example 19-7, and be sure to add the using System.Windows.Media.Imaging statement, because you ll need it, and also be sure to add the public modifier to the class name.

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