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With this system, the user is given a list of passwords the first time she logs in, she is asked for the first password; the second time she logs in, she is asked the second password; and so on The major problem with this system is that no user will be able to remember all these passwords However, a device could be used that keeps track of all the different passwords the user would need to use each time she logs in This basic idea of such a device naturally leads us from the topic of something you know to the topic of something you have..

Even though .NET 4 overhauls the markup rendered by the menu control, developers still using .NET 3.5 SP1 won t be able to benefit from all the great work the ASP.NET team has done in fixing the generated markup across all the server-side controls. This type of markup is a constant reminder of why we want more control over our HTML! One of the original strengths of server controls is that they can modify the markup rendered based on a browser. This was of critical importance in 2002, when the popular browsers treated markup in a very different way. This varied rendering was more important than control over the markup it was worth having to deal with generated markup and ClientIDs for the sake of cross-browser compatibility. Fast-forward to today. The major browsers now are on board with XHTML, and the same markup works well in various browsers. The architectural trade-offs are different, and the need to compromise on messy markup no longer exists.

Listing 11-16. Test the MyIPAddress Widget (ipaddresstest.c) #include <gtk/gtk.h> #include "myipaddress.h" static void ip_address_changed (MyIPAddress*); int main (int argc, char *argv[]) { GtkWidget *window, *ipaddress; gint address[4] = { 1, 20, 35, 255 }; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "MyIPAddress"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); g_signal_connect (G_OBJECT (window), "destroy", G_CALLBACK (gtk_main_quit), NULL); ipaddress = my_ip_address_new (); my_ip_address_set_address (MY_IP_ADDRESS (ipaddress), address); g_signal_connect (G_OBJECT (ipaddress), "ip-changed", G_CALLBACK (ip_address_changed), NULL); gtk_container_add (GTK_CONTAINER (window), ipaddress); gtk_widget_show_all (window); gtk_main (); return 0; } /* When the IP address is changed, print the new value to the screen. */ static void ip_address_changed (MyIPAddress *ipaddress) { gchar *address = my_ip_address_get_address (ipaddress); g_print ("%s\n", address); g_free (address); }

Two commonly used controls are <asp:TreeView /> and <asp:Calendar />. The TreeView nodes are postback links, but the visual aspect works just fine. The calendar relies heavily on the postback model for navigation, so it doesn t function in ASP.NET MVC except when viewing a single month. We still need tree views, and we still need calendars. With ASP.NET MVC, we ll tend to use more client-side UI functionality, such as that found in jQuery UI, which has a rich JavaScript calendar and more. We ve so far neglected the big daddy of ASP.NET server controls. Yes, we re talking about the GridView. The GridView is an interesting case, because it has so many different forms. At its simplest, the GridView is just an HTML table it s great for displaying tabular data. If we don t require any postback, then it should work, right It does, but there are a few gotchas along the way.

This MyIPAddress widget is a very simple example of creating a new widget. For use in an actual application, it would have to be expanded greatly. For example, you would want to customize the pop-up menu that is displayed when the user right-clicks the widget. Another enhancement would be to allow the programmer to define custom IP address formats. You may want to try expanding the MyIPAddress widget before continuing on to the next section so that you can better understand what was covered in this section.

Defense-in-depth, also referred to as redundancy, is the second design principle we will discuss in this chapter. To start with a common real-world example, consider how some banks protect themselves from bank robbers.

The first issue is that there s no declarative way to bind the GridView to data coming from ViewData. It s possible to employ data-binding code directly in the view markup, inside <% %> code blocks as listing 7.1 demonstrates. This type of code should send bad vibes up your spine, but it s possible.