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The ASP.NET MVC 1.0 release provided a lot of out-of-the-box functionality, but one common piece was missing: user input validation. Integrating validation frameworks with the 1.0 release was quite difficult, because the hooks to put in validation weren t fully formed. With ASP.NET MVC 2 comes full support for validation frameworks, as well as built-in support for Microsoft s Data Annotations library. Many web applications require some level of easy validation from the initial login screen. In this chapter, we ll examine the built-in validators provided in the Data Annotations library. Then we ll look at extending the model metadata providers with richer, more convention-driven behavior. Finally, we ll describe how to enable client-side validation support.

For example, a requisition will not be honored when the top-level widget cannot be resized Conversely, once a widget has been given a size allocation by its parent, the widget has no choice but to redraw itself with the new size Therefore, you should be careful where you call gtk_widget_size_allocate() In most cases, gtk_widget_set_size_request() is best to use for resizing widgets..

This HTML fragment defines an HTML form with the given action URL and a hidden input field named cmd. The form has a name attribute, which causes the browser to expose a reference to the form s corresponding DOM object as the DOM property document.f. The included JavaScript invokes the submit() method on the form s DOM object, which instructs the browser to submit the form with an HTTP POST request to the action URL just as if the user had clicked the form s submit button. Thus, when this HTML document is loaded into the user s browser, the form will be submitted to our web application without any user interaction.

<%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage<IEnumerable<CustomerSummary>>" %>

The GtkContainer class currently provides four signals. These are add, check_resize, remove, and set_focus_child: add: A child widget was added or packed into the container. This signal will be emitted even if you do not explicitly call gtk_container_add() but use the widget s built-in packing functions instead. check_resize: The container is checking whether it needs to resize for its children before taking further action. remove: A child has been removed from the container. set_focus_child: A child of the container has received focus from the window manager. Now that you know the purpose of the GtkContainer class, we will progress onto other types of container widgets. You have already learned about windows, a type of GtkBin widget, so we will begin this chapter with a layout container called GtkBox.

The Inherits attribute in listing 2.3 specifies that the view s model (the ViewData.Model property) is of type IEnumerable<CustomerSummary>. Because we designed our model to work with our screen, it s easy to mark up with HTML, as shown in listing 2.4.

HTTP by itself is a stateless protocol that is, successive HTTP requests initiated by the same user with the same browser a priori appear to the server as completely independent requests without any particular correspondence Web applications whose behavior depends on which user a particular request is associated with use one of several techniques to determine this association We described these techniques in 7, and we summarize them here: HTTP authentication: The HTTP protocol defines mechanisms by which the browser requests authentication credentials (username and password) from the user and then automatically supplies these credentials in a special HTTP header along with each request to the server (Franks et al 1999) Cookie authentication: A second commonly used HTTP request authentication scheme is based on HTTP cookies (Kristol and Montulli 2000) Here, the application requests the user s authentication credentials in an HTML form.

GtkBox is an abstract container widget that allows multiple children to be packed in a onedimensional, rectangular area. There are two types of boxes: GtkVBox packs children into a single column, and GtkHBox packs them into a single row.

<table> <tr> <th>Name</th> <th>Active </th> <th>Service Level</th> <th>Order Count</th> <th>Most Recent Order Date</th> Specifies </tr> IEnumeable<CustomerSummary> <% foreach (var summary in Model) { %> <tr> <td><%= summary.Name %></td> <td><%= summary.Active "Yes" : "No" %></td> Works with <td><%= summary.ServiceLevel %></td> model <td><%= summary.OrderCount %></td> <td><%= summary.MostRecentOrderDate %></td> </tr> <% } %> </table>