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Font-Names="Verdana" Font-Size="XX-Small" ForeColor="#0000cd" Text='<%# DataBinder.Eval(Container.DataItem, "Text") %>' runat="server"> </asp:HyperLink> </ItemTemplate> </asp:DataList> </td> </tr> </table> Finally, here s the typical web-page code you would use to define a list of links and display it by binding it to the LinkTable user control: protected void Page_Load(object sender, System.EventArgs e) { // Set the title. LinkTable1.Title = "A List of Links"; // Set the hyperlinked item list. LinkTableItem[] items = new LinkTableItem[3]; items[0] = new LinkTableItem("Test Item 1", "http://www.apress.com"); items[1] = new LinkTableItem("Test Item 2", "http://www.apress.com"); items[2] = new LinkTableItem("Test Item 3", "http://www.apress.com"); LinkTable1.Items = items; } Once it s configured, the web-page code never needs to interact with this control again. When the user clicks one of the links, the user is just forwarded to the new destination without needing any additional code. Another approach would be to design the LinkTable so that it raises a serverside click event. You ll see that approach in the next section.

When using StateServer mode, you can also set an optional stateNetworkTimeout attribute that specifies the maximum number of seconds to wait for the service to respond before canceling the request. The default is 10 seconds.

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In this chapter, you learned how to create some simple and some sophisticated user controls. You also saw how to load user controls dynamically and how to cache them. Though user controls are easy to create, they don t solve every custom control challenge. In fact, user controls are quite limited in scope (they can t be easily shared across applications), and they have limited design-time support (for example, you can t attach event handlers in the Properties window). User controls also lack advanced features and aren t well suited to rendering HTML and JavaScript on the fly. To improve on this situation, you can step up to custom controls, which are much more sophisticated and quite a bit more complicated to create. 27 describes custom controls.

Another way that communication can occur between a user control and a web page is through events. With methods and properties, the user control reacts to a change made by the web-page code. With events, the story is reversed the user control notifies the web page about an action, and the web-page code responds. Usually, you ll delve into events when you create a user control that the user can interact with. After the user takes a certain action such as clicking a button or choosing an option from a list your user control intercepts a web control event and then raises a new, higher-level event to notify your web page. The first version of LinkTable control is fairly functional, but it doesn t use events. Instead, it simply creates the requested links. To demonstrate how events can be used, the next example revises the LinkTable so that it notifies the user when an item is clicked. Your web page can then determine what action to take based on which item was clicked. The first step to implement this design is to define the events. Remember that to define an event you must use the event keyword with a delegate that represents the signature of the event. The .NET standard for events specifies that every event should use two parameters. The first one provides a reference to the control that sent the event, and the second one incorporates any additional information. This additional information is wrapped into a custom EventArgs object, which inherits from the System.EventArgs class. (If your event doesn t require any additional information, you can just use the generic System.EventArgs object, which doesn t contain any additional data. Many events in ASP.NET, such as Page.Load or Button.Click, follow this pattern.)

This setting instructs ASPNET to use an SQL Server database to store session information, as identified by the sqlConnectionString attribute This is the most resilient state store but also the slowest by far To use this method of state management, you ll need to have a server with SQL Server installed When setting the sqlConnectionString, you follow the same sort of pattern you use with ADONET data access (which is described in Part 2) Generally, you ll need to specify a data source (the server address) and a user ID and password, unless you re using SQL integrated security In addition, you need to install the special stored procedures and temporary session databases These stored procedures take care of storing and retrieving the session information ASPNET includes a Transact-SQL script for this purpose called InstallSqlStatesql It s found in the c:\[WinDir]\ MicrosoftNET\Framework\[Version] directory.

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