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Discussions on delegation and impersonation can sometimes be confusing because it seems like impersonation and delegation are two different concepts even though they aren t. Delegation is a form of impersonation involving an account that can be authenticated on a remote machine. Here s how it works. Impersonating an account requires that you provide credentials for the account you want to impersonate. After successfully authenticating that account, Windows associates an access token containing the security context of the account with the process or thread on which you re running the impersonation. Access tokens only contain the security context for an authenticated account, so the security context remains valid on the local machine and no further authentication is ever required. The real question is what happens when that process or thread attempts to access a resource on a remote machine Remote machines don t blindly accept access tokens from other machines, so the remote machine wants to verify the credentials of the security context contained in the access token. If you re using an account that is only available on the local machine, then the remote machine has no way of authenticating the request, and the account can t be used for delegation. When both the local and remote computers can authenticate the credentials from an account, the account supports delegation, and the request may be processed by the remote machine.

When you use the test web server, it runs all code using your user account. This is different from the much more limited behavior you ll see in IIS, which uses a less-privileged account to ensure security. It s important to understand the difference, because if your application accesses protected resources (such as the file system, a database, the registry, or an event log), you ll need to make sure you explicitly allow the IIS user. For more information about IIS and the hosting model, refer to 18.

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Visual Studio provides a rich, powerful development environment with automatic completion and default properties, as well as custom property editors to speed developers coding efforts. There are a few different technologies available to integrate and extend the Visual Studio environment. Attributes provide one means to extend Visual Studio and are used to integrate custom server controls into the environment. Before we present a quick overview of the most important design-time attributes, we provide a short background on attributes.

Single-step debugging allows you to execute your code one line at a time. It s incredibly easy to use. Just follow these steps: 1. Find a location in your code where you want to pause execution, and start single-stepping (you can use any executable line of code but not a variable declaration, comment, or blank line). Click in the margin next to the line code, and a red breakpoint will appear (see Figure 2-22).

You can see how impersonation and access tokens work using the Run As feature in Windows Explorer. For this example, you need to create two new user accounts on your system. Call one Manager and the other Employee. Make sure you set their passwords to something you ll remember. Then create a folder named Managers Only somewhere on your hard drive. Rightclick on the folder and click Properties from the context menu to bring up the Folder Properties dialog box. Locate the Security tab on the dialog box.

Figure 2-22. Setting a breakpoint 2. Now start your program as you would ordinarily. When the program reaches your breakpoint, execution will pause, and you ll be switched back to the Visual Studio code window. The breakpoint statement won t be executed. 3. At this point, you have several options. You can execute the current line by pressing F11. The following line in your code will be highlighted with a yellow arrow, indicating that this is the next line that will be executed. You can continue like this through your program, running one line at a time by pressing F11 and following the code s path of execution. Or, you can exit break mode and resume running your code by pressing F5.

The design-time representation of your content pages can range from excellent to poor. For the simple header and footer example, you ll see a fairly good representation of your content page that includes all the elements of the master page and the additional content you ve added. The parts you ve acquired from the master page will be shaded in gray, indicating you can t select or change them in any way. Instead, you ll be limited to inserting comments into the ContentPlaceHolder region, as shown in Figure 15-12.

An attribute is essentially a class that contains properties and methods used to modify other classes, class methods, or class properties. Attribute information is stored with the metadata of the element and can be retrieved at runtime through reflection. Attributes can be applied to an entire class or to a specific class method or property. Attribute classes are defined as public classes. All attributes derive directly or indirectly from the System. Attribute class, and attribute classes generally end in the word Attribute to enhance readability. Here is a sample attribute declaration: public class SampleAttribute : Attribute { } An attribute is declared within brackets just before the element to which it is applied. The syntax consists of calling a constructor on the attribute. Here is how an attribute is applied to a class method:

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