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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.

You can apply multiple attributes to a particular class, method, or property. There are two ways to do this. One syntax is to separate attributes by a comma within a set of brackets: [DefaultProperty("Text"), toolboxdata("<{0}:mylabel runat=server></{0}:mylabel>")] public class SuperLabel : Label {...} The other syntax is to put each attribute in its own set of brackets: [DefaultProperty("Text")] [ToolboxData("<{0}:mylabel runat=server></{0}:mylabel>")] public class SuperLabel : Label {...} This completes our whirlwind tour of attributes and of the most common design-time attributes available for use on custom controls. In this section we provided a short overview of basic Designer attributes that we use in the code samples in this book. We cover design-time support in more detail in 11.

Figure 15-14. A table-based layout 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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Figure 12-6. Notice that cmd.exe and notepad.exe are running under the Manager account, whereas the other processes are running under the Employee account Since you launched the Notepad.exe process from the CMD.EXE process, and the CMD.EXE process has a Manager access token, the Notepad.exe process also has a Manager access token. Use Notepad to open up the text file in the Managers Only folder. Now you can access the folder and file because Notepad is running under the appropriate security context.

To 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.

Figure 15-15 shows the resulting master page and a content page that uses the master page. 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.

Determining an appropriate security strategy for your application requires a basic understanding of how the different components associated with ASP.NET work together and communicate security information to one another. This section provides you with an overview of the security touch points between the browser, IIS, ASP.NET, and various system resources such as the file system, databases, and enterprise services. It also describes various internal security mechanisms in ASP.NET. Because this discussion focuses on security interaction between various components, it may help you to have a visual roadmap of those components. Figure 12-7 shows the items involved in processing an ASP.NET request and the sequence in which the request passes through those components.

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 The problem shows up if you place the master page in a different directory from the content page that uses it This is a recommended best practice for large websites In fact, Microsoft encourages you to use a dedicated folder for storing all your master pages However, if you re not suitably careful, this can cause problems when you use relative paths For example, imagine you put a master page in a subfolder named MasterPages and add the following <img> tag to the master page: <img src="bannerjpg" /> Assuming the file \MasterPages\bannerjpg exists, this appears to work fine.

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