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When you apply a theme to a page, ASP.NET considers each control on your web page and checks your skin files to see if they define any properties for that control. If ASP.NET finds a matching tag in the skin file, the information from the skin file overrides the current properties of the control. Figure 15-4 shows the result of applying the FunkyTheme to a simple page. The first picture shows the Themes.aspx page in its natural state, with no theme. The second picture shows the same page with the FunkyTheme applied. All the settings in FunkyTheme are applied to the controls in Themes.aspx, even if they overwrite values you ve explicitly set in the page (such as the background for the list box). However, details that were in the original page but that don t conflict with the theme (such as the custom font for the buttons) are left in place.

Table 12-1. Security Terms and Definitions (Continued)

The previous examples are very simple controls in concept. This was by design; we focused on the details required to build the simplest of controls in order to give you a taste of the controlbuilding process. In this section, we demonstrate how, with just a little bit of code, it is possible to add pleasing functionality through inheritance to one of the existing ASP.NET controls. In this simple inheritance example, we ll add a 3-D look to the WebControl TextBox class. To add this UI behavior, we take advantage of the DHTML features of Internet Explorer when rendering our new server control. Listing 2-18 contains TextBox3d s class file. Listing 2-18. The TextBox3d Class File using using using using using System; System.Web.UI; System.Web.UI.WebControls; System.ComponentModel; System.Drawing;

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As you ve seen, when properties conflict between your controls and your theme, the theme wins. However, in some cases you might want to change this behavior so that your controls can fine-tune a theme by specifically overriding certain details. ASP .NET gives you this option, but it s an all-ornothing setting that applies to all the controls on the entire page. To make this change, just use the StyleSheetTheme attribute instead of the Theme attribute in the Page directive. (The StyleSheetTheme setting works more like CSS.) Here s an example: <%@ Page Language="C#" AutoEventWireup="true" ... StyleSheetTheme="FunkyTheme" %> Now the custom yellow background of the ListBox takes precedence over the background color specified by the theme. Figure 15-5 shows the result and a potential problem. Because the foreground color has been changed to white, the lettering is now difficult to read. Overlapping formatting specifications can cause glitches such as this, which is why it s often better to let your themes take complete control by using the Theme attribute.

It s possible to use both the Theme attribute and the StyleSheetTheme attribute at the same time so that some settings are always applied (those in the Theme) and others are applied only if they aren t already specified in the control (those in the StyleSheetTheme). Depending on your point of view (and level of comfort with themes and styles), this is either a terribly confusing design or a useful way to make a distinction between settings you want to enforce (Theme) and settings you want to use as defaults (StyleSheetTheme).

Permissions allow you to specify whether a given account or role will be granted or denied access to a specific resource Different resources allow different sets of permissions The file system, for example, lets you to set permissions allowing or denying users to read, write, modify, list, and execute files SQL Server lets you set permissions allowing or denying users to create databases, create tables, edit rows of data, and so on Process by which an entity provides credentials as proof of its identity The system checks the credentials and determines whether the entity really is who it says it is Information used for authentication purposes normally containing the name of the account and some piece of information that only the account holder should know or possess Credentials are normally supplied as a username/password pair, but may be certificate- or biometrically based.

Figure 15-5. Giving the control tag precedence over the theme Another option is to configure specific controls so they opt out of the theming process entirely. To do this, simply set the EnableTheming property of the control to false. ASP .NET will still apply the theme to other controls on the page, but it will skip over the control you ve configured. <asp:Button ID="Button1" runat="server" ... EnableTheming="false" />

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