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Occurs when the cell is about to be put in edit mode. You can examine the column and row that are currently being edited, check the cell value, and cancel this operation using the DataGridBeginningEditEventArgs.Cancel property. Used for template columns. At this point, you can perform any last-minute initialization that s required for the editing controls. Use DataGridPreparingCellForEditEventArgs.EditingElement to access the element in the CellEditingTemplate. Occurs when the cell is about to exit edit mode. DataGridCellEditEndingEventArgs.EditAction tells you whether the user is attempting to accept the edit (for example, by pressing Enter or clicking another cell) or cancel it (by pressing the Escape key). You can examine the new data and set the Cancel property to roll back an attempted change. Occurs when the user navigates to a new row after editing the current row. As with CellEditEnding, you can use this point to perform validation and cancel the change. Typically, you ll perform validation that involves several columns for example, ensuring that the value in one column isn t greater than the value in another.

If you need a place to perform validation logic that is specific to your page (and so can t be baked into the data objects), you can write custom validation logic that responds to the CellEditEnding and RowEditEnding events. Check column rules in the CellEditEnding event handler, and validate the consistency of the entire row in the RowEditEnding event. And remember that if you cancel an edit, you should provide an explanation of the problem (usually in a TextBlock elsewhere on the page).

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In this chapter, you took a closer look at the ItemsControl classes provided by WPF. You learned how to use the ListView to create lists with multiple viewing modes, the TreeView to show hierarchical data, and the DataGrid to view and edit a dense assortment of data in a single place. The most impressive aspect of all these classes is that they derive from a single base class the ItemsControl that defines their essential functionality. The fact that all these controls share the same content model, the same data binding ability, and the same styling and templating features is one of WPF s small miracles. Remarkably, the ItemsControl defines all the basics for any WPF list control, even those that wrap hierarchical data, like the TreeView. The only change in the model is that the children of these controls (TreeViewItem objects) are themselves ItemsControl objects, with the ability to host their own children.

In the previous two examples, you ve created pages that triggered the identity selector and posted the token to a secondary page. In this exercise, you ll expand on that solution to retrieve and display the token: 1. Right-click the website, and select Add New Item. 2. Select Web Form, and name the form DisplayEncryptedToken.aspx. 3. On the form, enter the text This is your encrypted token:. 4. Below the text, add a label to the form, and name it lblEncryptedToken. 5. In the designer, click the Source tab. 6. Modify the page directive to include validateRequest="false". 7. Your page directive should look like this: <%@ Page Language="C#" AutoEventWireup="true" CodeFile="DisplayEncryptedToken.aspx.cs" Inherits="EncryptedToken" ValidateRequest="false" %> 8. From the menu bar in Visual Studio, select View Code. 9. In the form load event, enter the following code: protected void Page_Load(object sender, EventArgs e) { string xmlToken; xmlToken = Request.Params["xmlToken"]; if (xmlToken == null || xmlToken == "") { xmlToken = "N/A. No token was provided."; } lblEncryptedToken.Text = xmlToken; }

Windows are the basic ingredients in any desktop application so basic that the operating system is named after them. And although WPF has a model for creating navigation applications that divide tasks into separate pages, windows are still the dominant metaphor for creating applications. In this chapter, you ll explore the Window class. You ll learn the various ways to show and position windows, how window classes should interact, and what built-in dialog boxes WPF provides. You ll also look at more exotic window effects, such as nonrectangular windows, windows with transparency, and windows with the Aero glass effect. Finally, you ll explore WPF s support for programming the Windows 7 taskbar.

What s New One of the disappointments in earlier versions of WPF was the lack of built-in support for new

This calls all of the subscribed handlers. With this brief example, it s easy to see that events separate the source of a state change from the target handlers. Rather than have the source maintain a list of references to the subscribers, the event itself is in charge of this registration. The source is then free to invoke the event, sending a message to all of the disparate subscribers that this event has occurred.

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