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by hand, it also gives us an opportunity to explore a few details of the data binding system that we might otherwise not have seen, so we ll go with that. The ListView control is in the Common Controls section of the Toolbox. When we drag it onto the top panel in the SplitContainer, we need to fix a few things with the Tasks pop up. First, we want the list view to fill the whole of the top panel there s a Dock in parent container task just for that. We also have to change its View the default is LargeIcon, but we need to change that to Details for the multicolumn view we want. And finally, we need to tell it about the columns, by clicking the Edit Columns task.

The ColumnHeader Collection Editor opens. Clicking Add a couple of times adds two columns. As Figure 22-4 shows, Visual Studio has been characteristically unadventurous with the names columnHeader1 and columnHeader2 don t say much. These are the names it will give to the fields that make these objects accessible to us in the code behind. It s usually a good idea to provide more informative names each time you add anything in the Windows Forms designer whether it s a control, a nonvisual component, or a column like this. Otherwise, your program rapidly acquires a long list of incomprehensible identifiers. So we ll set the (Name) on the right to titleColumn for the first column, and dueDateColumn for the second. Of course, we also want the displayed text in the column headers to be a bit more useful than the default, ColumnHeader, so we ll change the Text property of the two columns to Title and Due Date, respectively. Finally, to ensure that the two columns make reasonably good use of the space initially available, we ll set their Width properties to 200 and 70. Figure 22-5 shows how the form looks once this is done. We haven t given the ListView itself a good name yet, so we ll call it entriesListView.

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Some developers have a stylistic objection to field or variable names that include information about the type, and would argue that entriesList View is unnecessarily verbose. However, it s quite common in UI applications to have several different objects all representing the same thing at different layers we ve put the underlying model in a field called entries, we have the binding source representing that model to the data binding system, which we ve called entriesSource, and we have a control displaying the information, called entriesListView. Clearly these objects can t all be called entries. We could call the control entries View, but that sounds less like an individual control and more like a description of the whole form we re building right now. So entriesList View feels right because it seems to be a minimally descriptive and unique name. We would not recommend just slapping the type name on the end of your control names out of habit, of course. Choosing identifier names requires thought (and that goes for all identifiers, not just those in Windows Forms apps). You should aim for the shortest possible name that will make it easy to understand the code when you return to it six months after you wrote it. If that happens to be a name that includes the type name, that s fine, as long as you thought about it first.

Given that it is possible to search a key space of 256 keys in a reasonable amount of time, you might ask the question of how much does adding more key bits help How long would it take for an attacker to conduct a brute-force attack on, say, a 128-bit key It turns out that it is just too much work for an attacker to be able to compute all possible 2128 decryptions Even if an attacker could do ten trillion (1013) decryptions per second per CPU, and she had access to one billion CPUs to do this concurrently, it would still take over one billion years to try all possible 128-bit keys In the next subsection, we explore how we can build a symmetric cipher using DES that supports longer keys..

Finally, ListView supports multiple-item selection, but we want to have only one item selected at a time. Since multiple selection is the default, we need to set the MultiSelect property to false. Next, we ll add a TextBox so that the user can edit entry titles and a corresponding Label so that the user can see what the TextBox is for. These controls are found in the Common Controls section of the toolbar. We ll set the Text property of the Label to &Title: the ampersand denotes an access key so that the user can press Alt-T to put the focus into the text box. Access keys make user interfaces much easier to use from the keyboard.

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When you give a Label an access key, it puts the focus into whichever control is next in the tab order. By default, the tab order will be the order in which you added the controls to the form. But you can change this by selecting the View menu s Tab Order item (which is present only when a Windows Forms design view has the focus). When you enable Tab Order mode, you can click on the controls one after another, and the order in which you click will define the tab order. Therefore, your life will be marginally easier if you add each Label control just before you add the associated TextBox control because you won t then need to go back and redo the tab order.

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