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Although server controls are more powerful than user controls, most of the concepts you ve learned in this chapter apply to server controls in the same way that they apply to user controls. For example, you can create server controls that include properties and methods, use custom objects, fire events, and expose child controls.

In the LinkTable example, it makes sense to transmit basic information about what link was clicked. To support this design, you can create the following EventArgs object, which adds a readonly property that has the corresponding LinkTableItem object: public class LinkTableEventArgs : EventArgs { private LinkTableItem selectedItem; public LinkTableItem SelectedItem { get { return selectedItem; } } private bool cancel = false; public bool Cancel { get { return cancel; } set { cancel = value; } } public LinkTableEventArgs(LinkTableItem item) { selectedItem = item; } } Notice that the LinkTableEventArgs defines two new details a SelectedItem property that allows the user to get information about the item that was clicked and a Cancel property that the user can set to prevent the LinkTable from navigating to the new page. One reason you might set Cancel is if you want to respond to the event in your web-page code and handle the redirect yourself. For example, you might want to show the target link in a server-side <iframe> or use it to set the content for an <img> tag rather than navigating to a new page. Next, you need to create a new delegate that represents the LinkClicked event signature. Here s what it should look like: public delegate void LinkClickedEventHandler(object sender, LinkTableEventArgs e); Using the LinkClickedEventHandler, the LinkTable class defines a single event: public event LinkClickedEventHandler LinkClicked; To intercept the server click, you need to replace the HyperLink control with a LinkButton, because only the LinkButton raises a server-side event. (The HyperLink simply renders as an anchor that directs the user straight to the target when clicked.) Here s the new template you need: <ItemTemplate> <img height="23" src="exclaim.gif" width="25" align="absMiddle" border="0"> <asp:LinkButton id="HyperLink1" Font-Names="Verdana" Font-Size="XX-Small" ForeColor="#0000cd" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "Text") %>' CommandArgument='<%# DataBinder.Eval(Container.DataItem, "Url") %>'> </asp:LinkButton> </ItemTemplate>

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You can run this script using an SQL Server utility such as OSQLexe or Query Analyzer It needs to be performed only once If you decide to change your state service, you can use UninstallSqlStatesql to remove the state tables The session state timeout still applies for SQL Server state management That s because the InstallSqlStatesql script also creates a new SQL Server job named ASPState_Job_DeleteExpired_ Sessions As long as the SQLServerAgent service is running, this job will be executed every minute Additionally, the state tables will be removed every time you restart SQL Server, no matter what the session timeout That s because when you use InstallSqlState, the state tables are created in the tempdb database, which is a temporary storage area If this isn t the behavior you want, you can use the InstallPersistSqlStatesql and UninstallPersistSqlStatesql scripts instead of InstallSqlStatesql and UninstallSqlState.

uilding a professional web application involves much more than designing individual web pages. You also need the tools to integrate your web pages into a complete, unified website. In this chapter, you ll consider two new ASP.NET features that let you do that. First up is a feature called themes, which let you define the formatting details for various controls and seamlessly reuse these formats in multiple pages. Themes make it much easier to standardize your website s look and feel and tweak it later. Once a theme is in place, you can give your entire website a face-lift just by changing the theme definition. A more impressive innovation is master pages, which let you create reusable page templates. Using a master page, you can define the layout for your website pages, complete with all the usual details such as headers, menu bars, and ad banners. Once you ve formalized this structure, you can use the master page throughout your website, ensuring that all pages have the same design. Visitors can then surf from one section to another without noticing any change. In this chapter, you ll learn how to use themes and master pages, two features that are new in ASP .NET 2.0, to standardize your websites.

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