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The BindingList<T> class raises events when its contents change, enabling the Windows Forms data binding system to remain up-to-date if we add or remove data items. So the binding source now has the objects, and because we ve configured the source appropriately, Visual Studio will know exactly what properties are available and will be able to connect those to any controls we add to our user interface. So next, we re going to need to add some controls.

As with all technologies, mashup technologies evolved over time. Figure 1-2 shows the progression of technologies that emerged and serve as a foundation for mashup development.

The Control class in Windows Forms is the base class of almost all visual elements. A handful of exceptions most notably menus and tool tips work differently in Windows Forms because they also work differently in Win32, but the vast majority of UI elements you ll use in a Windows Forms application will be controls.

This is a significant difference between Windows Forms and WPF. WPF s Control class (the one in System.Windows.Controls, as opposed to the Windows Forms one in System.Windows.Forms) is more specialized, as you saw in 20. In Windows Forms, not only do interactive elements such as Button derive from Control, so do layout elements. The nearest equivalent to the Windows Forms Control class in WPF and Silverlight is actually FrameworkElement.

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Our application is going to have a list of entries at the top, and some fields to edit the selected entry at the bottom We ll use a SplitContainer to arrange these two sections SplitContainer provides a draggable splitter bar that can be used to resize a pair of panels sharing some space on-screen We add this by dragging it from the Toolbox s Containers section onto the form It automatically fills the whole window However, it splits the window with a vertical splitter the two halves are on the left and right, but we wanted them on the top and bottom This is easily fixed, because like many controls, the SplitContainer offers a pop-up window for performing common tasks At the top-righthand corner of the control, a little arrow in a box appears, and if we click on this, the pop up appears, as Figure 22-3 shows.

At one time, DES was probably the most prevalently used symmetric encryption algorithm in the United States, not only in the financial industry but in other industries as well Today, however, DES is fairly susceptible to brute-force attack In a brute-force attack, attackers get ahold of some ciphertext and try decrypting it using every possible key In 1998, the Electronic Frontier Foundation (EFF) (wwwefforg), a privacy rights group, funded the development of a machine called Deep Crack to do exactly that Their intention was to prove that DES encryption was not as secure as some government organizations and corporations purported EFF s goal was to break DES in as short of an amount of time as possible Deep Crack was able to break DES in 56 hours using such a brute-force attack Since then, other machines have been developed that can crack DES even faster.

Clicking Horizontal splitter orientation gives use the orientation we require In the top half of the UI, we want a list showing each to-do entry We re likely to want to show at least a couple of pieces of information the entry title and its due date, for example The simple ListBox control is not sufficient here Unlike the WPF ListBox, Windows Forms cannot easily add multiple columns, because it s based on the Win32 ListBox It wouldn t be completely impossible as you can write code that customizes how each item is rendered, but that seems like an unnecessarily complex solution when the ListView provides multicolumn list support While ListView is the right control for presenting the information to the user, we just caused ourselves a problem.

Support for data binding in Windows Forms is somewhat uneven, and while you can data-bind a ListBox, you can t do that with ListView This puts us in a tricky situation: either we use a ListBox, compromising the UI to make life easier for us, the developers, or we have to do more work by hand to use the ListView, in order to do right by the end user Or we could use a data grid, but for such a simple application, it seems like overkill the ListView is something all Windows users will be familiar with, and it fits the bill And because it means doing a few things.

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