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Earlier, we configured a data source and then we added some controls to represent our data. Now it s time to connect the two. If we select the text box for the title, and then in the Properties panel scroll to the top of the list, there s an expandable (DataBindings) item, inside which is a list of properties you re likely to want to bind. (You can bind other properties, but most controls have only a handful of properties that it s likely to be useful to data-bind to.) If you show the drop down for the Text property, the reason for adding a binding source earlier becomes apparent. As Figure 22-9 shows, Visual Studio offers a list of available data sources (just the one here our form s entriesSource), which you can expand to select the property you require. We ll bind the two text boxes and date picker (binding the Value property in that case) on our form to the three properties. To check that this is working, we ll need some data the list we created earlier is currently empty. We ll add a helper function to create a new item; we ll need this for when the user clicks the New button, as well as for creating an initial item for when the application starts:

private void CreateNewItem() { ToDoEntry newEntry = (ToDoEntry) entriesSource.AddNew(); newEntry.Title = "New entry";

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taking an input message, m, encrypting with the first key (k1), decrypting the resulting message with the second key (k2), and then encrypting that message with the third key (k3) You might be wondering why Triple DES does a decryption as part of its second step instead of just encrypting three times The reason is for backward compatibility If k1 = k2 = k3 (all the keys are the same), doing a Triple DES encryption is exactly equivalent to doing a DES encryption If your system used to use DES, and you were interested in upgrading to Triple DES without disturbing your software, then what you could do initially is use Triple DES and feed in the old key (k) by setting k1 = k2 = k3 = k, and your system would continue to function as before.

}

newEntry.DueDate = DateTime.Now; entriesSource.ResetCurrentItem();

The most important thing to remember is not when a particular technology was created but when it became relevant to the overall community. One key factor is wide vendor adoption. JavaScript would not be as important today if it had not been adopted by Microsoft and Netscape in their browsers. Netscape created JavaScript (originally called LiveScript) in 1995 in its browser Netscape Navigator. It wasn t until late 1996 that Microsoft shipped JScript (its own implementation of JavaScript) in its browser Internet Explorer. JavaScript became a de facto standard because it was used by virtually 100 percent of the market s browsers. Any newcomers in the browser arena had to implement JavaScript to be considered a viable alternative browser. JSON was introduced as a JavaScript-based data format in 1999. It took over seven years to become relevant to the web development community. But as the web development community realized the need for a simple lightweight way to transfer data besides XML, JSON was rediscovered. Before each of these technologies is explained, it is important to further categorize them into the roles they play in mashup development, which is done in Figure 1-3.

Notice that we re using the AddNew method offered by the binding source this means the binding system is aware that a new item is being created, and if other controls end up being bound to the same source, they will be aware of the change. We then modify two of the properties.

Since we re using a BindingList, the data binding system would also be aware of a new item if we just added it directly to the entries collection. However, there s a subtle difference with AddNew rather than just appearing on the end of the list view, this new item will become the selected item. And in fact, it ll be in a tentative state until we move to a different item or add another new one this program happens not to exploit this, but we could cancel the addition of a new item if the user presses the Escape key.

Our ToDoEntry class doesn t offer change notification events, so we had to tell the binding source that it needs to refresh any controls bound to the current item by calling ResetCurrentItem. If we implemented INotifyPropertyChanged on ToDoEntry so that it raised an event anytime a property changed, this last line would be unnecessary. We need to add a call to this new method in our constructor so that we have one entry to start with:

Triple DES provides existing DES users with an easy upgrade path to start using Triple DES Once the system is tested for reliability and stability with Triple DES, you can then increase security by using three different keys Backward compatibility was built into Triple DES partially to support many systems that used microchips implementing regular DES in hardware These microchips needed to be replaced with microchips that ran Triple DES The design of Triple DES allowed the DES chips to be replaced with Triple DES chips with minimal system disruption However, the backward compatibility in Triple DES is also useful for softwarebased implementations Using Triple DES (with three different 56-bit keys) allows you to achieve a higher level of security than with just one 56-bit key.

public Form1() { InitializeComponent(); entriesSource.DataSource = entries; } CreateNewItem();

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