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For example, consider the following user control: <%@ Control Language="C#" AutoEventWireup="true" CodeFile="VaryByControl.ascx.cs" Inherits="VaryByControl" %> <asp:DropDownList id="lstMode" runat="server" Width="187px"> <asp:ListItem>Large</asp:ListItem> <asp:ListItem>Small</asp:ListItem> <asp:ListItem>Medium</asp:ListItem> </asp:DropDownList> <br /> <asp:button ID="Button1" text="Submit" OnClick="SubmitBtn_Click" runat=server/> <br /><br /> Control generated at:<br /> <asp:label id="TimeMsg" runat="server" /> When the button is clicked, it displays the current date in one of three formats. protected void Page_Load(object sender, EventArgs e) { switch (lstMode.SelectedIndex) { case 0: TimeMsg.Font.Size = FontUnit.Large; break; case 1: TimeMsg.Font.Size = FontUnit.Small; break; case 2: TimeMsg.Font.Size = FontUnit.Medium; break; } TimeMsg.Text = DateTime.Now.ToString("F"); } It s not sufficient to keep one cached copy of this page, because the display format changes depending on the selection in the lstMode control (see Figure 14-9).

Caution If you use named skins, you ll need to be careful that every theme uses the same names and provides tags for the same controls. If a control specifies the SkinID attribute and ASP.NET can t find a matching skin for that control in the theme, the control won t be themed, and it will keep its current formatting.

Figure 14-9. Content that varies by control selection You can handle this using the VaryByControl attribute and referring specifically to this control: <%@ OutputCache Duration="30" VaryByControl="lstMode" %> When you try this example, you ll see a different date for each option, which emphasizes that ASP .NET maintains a separate cached copy for each list selection.

For a quick refresher on HTML tables, complete with information about how to specify borders, cell sizes, alignment, and more, refer to the examples at http://www.w3schools.com/html/html_tables.asp.

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If you use the same user control in ten different pages, ASP .NET will cache ten separate versions of that control. This gives each page the chance to customize the user control the first time is executed, before the user control is cached. However, in many cases you might find that you reuse the same user control on multiple pages and you don t need to introduce page-specific customizations. In this case, you can save memory by telling ASP .NET to share the cached copy of the control. ASP.NET enables this scenario through the Shared property of the OutputCache directive. The Shared property works only when you are applying the directive to a user control, not a web form. Here s an example: <%@ OutputCache Duration="10" VaryByParam="None" Shared="True" %> You can also make the same request by adding the PartialCaching attribute to the class declaration for the user control: [PartialCaching(10, null, null, null, true)] public class MyUserControl : UserControl { ... } The null parameters here represent VaryByParameter, VaryByControl, and VaryByCustom.

Standardizing the formatting of your website is only half the battle You also need to make sure that common elements, such as your website header and site navigation controls, appear in the same position on every page The challenge is to create a simple, flexible layout that can be replicated throughout your entire website You can use three basic approaches: User controls: User controls allow you to define a pagelet a portion of a web page, complete with markup and server-side code, that can be reused on as many web forms as you want User controls are a great way to standardize a common page element However, they can t solve the layout problem on their own, because there s no way to ensure that user controls are placed in the same position on every page 14 describes user controls.

To convert this example into something more practical, just replace the static text in the master page with the actual header, navigation controls, and footer you really want. All the child pages will acquire these features automatically. This is the first step for defining a practical structure for your entire website.

Summary

One quirk that can catch unsuspecting developers is the way that master pages handle relative paths. If all you re using is static text, this issue won t affect you. However, if you ve added <img> tags or any other HTML tag that points to another resource, problems can occur.

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