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{ 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.

it is shipped as source code. This means that customers using the Control Toolkit can modify the source code directly as well as seek help from the community and user forum resources.

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The concept of least privileged access means that you give roles and accounts enough permission to do their jobs, but no more. If a user needs the ability to read documents, then give the user the ability to read documents, but not to create or modify documents. If the user needs to create new documents, then give the user the ability to create new documents, but not to read or modify existing documents. Also make sure to add accounts only to those groups to which they belong. If someone needs to be in the Manager group, don t add him or her to the Administrator group also. Creating accounts and roles with least privileged access helps keep gaping holes from developing in your security. I saw one inexperienced network administrator give his users administrator level access to the entire network because they were having permissions issues accessing a single network share. Instead of looking into and fixing a small problem, he created a giant new one. He assumed it was okay to give everyone administrative rights because everyone in the small company was trustworthy, but failed to realize if any of those accounts were compromised by a hacker, the hacker would have free reign on the network. And you can never rule out the possibility of an irate employee using an internal account to sabotage a company resource before leaving. So make sure that your security only allows users and accounts to do what they need to do, nothing more. Next, let s take a look at how ASP.NET handles security.

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.

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.

A process is the memory space in which an executable program runs. When you launch Word, Visual Studio, or even Minesweeper, you re running a process. Inside of a process, there may be one or more threads of execution, or simply threads, running various tasks. IIS, for example, is a single process running on a server, but it creates numerous threads inside that single process to handle incoming requests. An access token is a Windows security object containing the security context of an authenticated account. Windows attaches an access token to each running process on the system to give the application a security context under which to run. As the process accesses resources, those resources use the security context in the access token for authorization purposes. This

The Control Toolkit has lots of useful and powerful AJAX controls and extenders with source code that can be used as-is in applications or server as example code for building your own AJAX-enabled server controls or an extender control that can apply AJAX functionality to an existing server control. The .NET Framework 3.5 provides additional enhancements to ASP.NET, building on the currently available ASP.NET AJAX functionality, which we cover in 9. In this chapter, we provide a quick demonstration of writing AJAX-enabled web pages ASP.NET style through the use of the UpdatePanel control.

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