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The strongly typed classes mentioned previously are called entities. Entities are a conceptual model of a physical database that maps to your business domain. Formally speaking, this model is termed an Entity Data Model (EDM). The EDM is a client-side set of classes that map to a physical database, but you should understand that the entities need not map directly to the database schema in so far as naming conventions go. You are free to restructure your entity classes to fit your needs, and the EF runtime will map your unique names to the correct database schema. For example, you might recall that you created the simple Inventory table in the AutoLot database using the database schema shown in Figure 23-1.

public class Main { private static final private static final 3306/usermanager_test"; private static final private static final String JDBC_DRIVE_CLASS_NAME = "com.mysql.jdbc.Driver"; String JDBC_URL = "jdbc:mysql://localhost: String JDBC_USERNAME = " apress "; String JDBC_PASSWORD = " sserpa ";

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As you saw in earlier chapters, all IPrincipal objects provide an IsInRole() method, which lets you evaluate whether a user is a member of a group. This method accepts the role name as a string name and returns True if the user is a member of that role. For example, here s how you can check if the current user is a member of the Supervisors role: If User.IsInRole("Supervisors") Then ' Do nothing; the page should be accessed as normal because the ' user has administrator privileges. Else ' Don't allow this page. Instead, redirect to the home page. Response.Redirect("Default.aspx") End If Remember that when using Windows authentication, you need to use the format DomainName\GroupName or ComputerName\GroupName. Here s an example: If User.IsInRole("FARIAMAT\Supervisors") Then ... End If This approach works for custom groups you ve created but not for built-in groups that are defined by the operating system. If you want to check whether a user is a member of one of the built-in groups, you use this syntax: If User.IsInRole("BUILTIN\Administrators") Then ... End If Of course, you can also cast the User object to a WindowsPrincipal and use the overloaded version of IsInRole() that accepts the WindowsBuiltInRole enumeration, as described in 22.

Figure 23-1. Structure of the Inventory table of the AutoLot database If you were to generate an EDM for the Inventory table of the AutoLot database (you ll see how to do so momentarily), the entity will be called Inventory by default. However, you could rename this class to Car and define uniquely named properties of your choosing, which will be mapped to the columns of the Inventory table. This loose coupling means that you can shape the entities so they closely model your business domain. Figure 23-2 shows such an entity class.

.NET includes another way to enforce role and user rules. Instead of checking with the IsInRole() method, you can use the PrincipalPermission class from the System.Security.Permissions namespace. The basic strategy is to create a PrincipalPermission object that represents the user or role information you require. Then, invoke the PrincipalPermission.Demand() method. If the current user doesn t meet the requirements, a SecurityException will be thrown, which you can catch (or deal with using a custom error page). The Demand() method takes two parameters one for the user name and one for the role name. You can omit either one of these parameters by supplying a null reference in its place. For example, the following code tests whether the user is a Windows administrator: Try Dim pp As New PrincipalPermission(Nothing, "BUILTIN\Administrators") pp.Demand()

Note In many cases, the client-side entity class will be identically named to the related database table. However, remember that you can always reshape the entity to match your business situation.

Now, consider the following Program class, which uses the Car entity class (and a related class named AutoLotEntities) to add a new row to the Inventory table of AutoLot. This class is termed an object context; the job of this class it is to communicate with the physical database on your behalf (you will learn more details soon): class Program { static void Main(string[] args) { // Connection string automatically read from // generated config file. using (AutoLotEntities context = new AutoLotEntities()) {

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