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The last step is to use ASP.NET s automatic postback events to make the card update dynamically every time an option is changed. The Update button could now be used to submit the final, perfected greeting card, which might then be e-mailed to a recipient or stored in a database. To configure the controls so they automatically trigger a page postback, simply add the AutoPostBack="True" attribute to each user input control. An example is shown here: Choose a background color:<br /> <asp:DropDownList id="lstBackColor" AutoPostBack="True" runat="server" Width="194px" Height="22px"/><br /><br /> Next, you need to create an event handler that can handle the change events. To save a few steps, you can use the same event handler for all the input controls. All the event handler needs to do is call the update routine that regenerates the greeting card. Protected Sub ControlChanged(ByVal sender As System.Object, _ ByVal e As System.EventArgs) _ Handles lstBackColor.SelectedIndexChanged, chkPicture.CheckedChanged, _ txtFontSize.TextChanged, lstBackColor.SelectedIndexChanged, _ lstBorder.SelectedIndexChanged, _ lstFontName.SelectedIndexChanged, _ lstForeColor.SelectedIndexChanged, _ ' Refresh the greeting card (because a control was clicked). UpdateCard() End Sub Protected Sub cmdUpdate_Click(sender As Object, e As EventArgs) _ Handles cmdUpdate.Click ' Refresh the greeting card (because the button was clicked). UpdateCard(); End Sub Private Sub UpdateCard() ' (The code that draws the greeting card goes here.) End Sub With these changes, it s easy to perfect the more extensive card-generating program shown in Figure 6-18. The full code for this application is provided with the online samples.

Pretty soon we re going to start writing some of the use cases for the Internet Bookstore. But before we do that, we need some way of organizing all of these use cases. In a decent-sized system, you could have anywhere from 100 use cases upward. Luckily, the UML provides us with the package mechanism, which is a way of grouping related elements (e.g., classes, diagrams, or use cases). Packages are basically hierarchical containers that can contain almost any UML constructs, including other packages. If you re a Java programmer, UML packages are not entirely dissimilar to Java packages, in that they allow you to divide your work broadly into different areas. For the Internet Bookstore, Figure 3-5 shows a package diagram containing four packages. Each package contains lots of use cases. In addition, the shopping package contains an actor (Customer), and the admin package contains four actors (Customer Service, Seller, Shipping Clerk, and Webmaster).

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Automatic postback isn t always best. Sometimes an automatic postback can annoy a user, especially Tip when the user is working over a slow connection or when the server needs to perform a time-consuming option. For that reason, it s sometimes best to use an explicit submit button and not enable AutoPostBack for most input controls.

You can pop up a menu to add a new constant, which brings up a dialog to fill in the name and value of the constant, as shown in Figure 22 2.

From this point on, the examples will adopt a few conventions designed to make code examples more concise and readable: The .aspx layout file is rarely shown with an example, unless it requires special coding (such as the creation of a template or data-binding syntax, two topics you ll explore in Part 3 of this book). The .aspx files are really nothing more than an ordering of standard control tags. The Imports statements in the code-behind file are omitted, unless they reference an unusual namespace that hasn t been identified. Generally, you ll reuse the same standard block of Imports statements for each code-behind file. These changes won t affect you if you re using an IDE such as Visual Studio, which generates the .aspx file, control variables, and most Imports statements automatically. And if you want to see the full details, you ll find them in the downloadable code.

This chapter introduced you to web controls and their object interface. As you continue through this book, you ll learn more about the web controls. The following highlights are still to come: In 8, you ll learn about advanced controls such as the AdRotator, the Calendar, and the validation controls. You ll also learn about specialized container controls, such as the MultiView and Wizard. In 11, you ll learn about navigation controls such as the TreeView and Menu. In 15, you ll learn about the GridView, DetailsView, and FormView high-level web controls that let you manipulate a complex table of data from any data source. In 25, you ll learn how you can use .NET inheritance to create your own customized web controls. For a good reference that shows each web control and lists its important properties, refer to the Visual Studio Help.

+ Add to Wish List + Cancel Order + Edit Shopping Cart + Login + Logout + Open an Account + Return a book + View Order History + Where's My Stuff

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