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In some cases, themes aren t used to standardize website appearance but to make that appearance configurable for each user. In this scenario, your web application gives the user the chance to specify the theme that your pages will use. This technique is remarkably easy. All you need to do is set the Page.Theme or Page.StyleSheet property dynamically in your code. The trick is that this step needs to be completed in the Page.Init event stage. After this point, attempting to set the property causes a compilation error. Here s an example that applies a dynamic theme by reading the theme name from the current Session collection: protected void Page_PreInit(object sender, EventArgs e) { if (Session["Theme"] == null) { // No theme has been chosen. Choose a default // (or set a blank string to make sure no theme // is used). Page.Theme = ""; } else

For the most part, HTML uses a flow-based layout. That means as more content is added, the page is reorganized and other content is bumped out the way. This layout can make it difficult to get the result you want with master pages. For example, if you aren t careful, you could craft the perfect layout, only to have the structure distorted by a huge block of information that s inserted into a <Content> tag. To control these problems, most master pages will use either HTML tables or CSS positioning to control the layout. With tables, the basic principle is to divide all or a portion of the page into columns and rows. You can then add a ContentPlaceHolder in a single cell, ensuring that the other content is aligned more or less the way you want. With CSS positioning, the idea is to separate your content into <div> tags and position these <div> tags by using absolute coordinates or by floating them on one side of the page. You ll then place the ContentPlaceHolder in the <div> tag.

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If you aren t sure if caching is in effect, you should test for a null reference before you attempt to use the user control object..

{ Page.Theme = (string)Session["Theme"]; } } Of course, you could also store the selected theme in a cookie, a session state, a profile (see 24), or any other user-specific location. If you want to create a page that allows the user to choose a theme, you need a little more sleight of hand. The problem is that the user s selection can t be read until after the page has been loaded and has passed the PreInit stage. However, at this point, it is too late to set the theme. One way around this problem is to trigger a refresh by redirecting the page back to itself. The most efficient way to accomplish this is to use Server.Transfer() so that all the processing takes place on the server. (Response.Redirect() sends a redirect header to the client and so requires an extra round-trip.) Here s the code that presents the list of selections when the page loads and then records the selection and transfers the page when a button is clicked: protected void Page_Load(object sender, EventArgs e) { if (!Page.IsPostBack) { // Fill the list box with available themes // by reading the folders in the App_Themes folder. DirectoryInfo themeDir = new DirectoryInfo(Server.MapPath("App_Themes")); lstThemes.DataTextField = "Name"; lstThemes.DataSource = themeDir.GetDirectories(); lstThemes.DataBind(); } } protected void cmdApply_Click(object sender, EventArgs e) { // Set the chosen theme. Session["Theme"] = lstThemes.SelectedValue; // Refresh the page. Server.Transfer(Request.FilePath); } Figure 15-8 shows the resulting page.

The following example shows how you can use master pages to create a traditional web application with a header, footer, and navigation bar, all of which are defined with tables. Figure 15-14 shows how this structure is broken up into a table.

If your user control contains input controls, it s difficult to use caching. The problem occurs if the content in the input controls affects the cached content that the user control displays. With ordinary caching, you re stuck reusing the same copy of the user control, regardless what the user types into an input control. (A similar problem exists with web pages, which is why it seldom makes sense to cache a web page that includes input controls.) The VaryByControl property solves this problem. VaryByControl takes a semicolon-delimited string of control names that are used to vary the cached content in much the same way that VaryByParameter varies the cached content for query string values.

If you use named skins, you can set the SkinID of a control declaratively when you design the page, or you can specify it dynamically in your code.

Here s the markup for the table: <table width="100%"> <tr><td colspan="2">My Header</td></tr> <tr> <td width="150px">Navigation Controls</td> <td> <asp:ContentPlaceHolder id="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </td> </tr> <tr><td colspan="2">My Footer</td></tr> </table>

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