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The PrincipalPermission attribute provides another way of validating the current user s credentials. It serves the same purpose as the PrincipalPermission class, but it s used declaratively. In other words, you attach it to a given class or method, and the CLR checks it automatically when the corresponding code runs. The exception handling now works a little bit differently: this time you cannot catch the exception within the function on which the attribute has been applied. You have to catch the exception in the function that actually calls this function. If you apply the PrincipalPermission attribute on an event procedure (such as Button_Click), you have to catch the exception in the global Application_Error event, which you can find in the global.asax file. When you use a PrincipalPermission attribute, you can restrict access to a specific user or a specific role. Here s an example that requires the user accessing the page to be in the server s Administrators group. If the user is not member of the web server s Administrators group, the ASP .NET runtime throws a security exception.

Given that the GivePromotion() method has been designed to take any possible type derived from Employee, one question on your mind may be how this method can determine which derived type was sent into the method. On a related note, given that the incoming parameter is of type Employee, how can you gain access to the specialized members of the SalesPerson and Manager types In addition to the as keyword, the C# language provides the is keyword to determine whether two items are compatible. Unlike the as keyword, however, the is keyword returns false, rather than a null reference, if the types are incompatible. Consider the following implementation of the GivePromotion() method: static void GivePromotion(Employee emp) { Console.WriteLine("{0} was promoted!", emp.Name); if (emp is SalesPerson) { Console.WriteLine("{0} made {1} sale(s)!", emp.Name, ((SalesPerson)emp).SalesNumber); Console.WriteLine(); } if (emp is Manager) { Console.WriteLine("{0} had {1} stock options...", emp.Name, ((Manager)emp).StockOptions); Console.WriteLine(); } } Here you are performing a runtime check to determine what the incoming base class reference is actually pointing to in memory. Once you determine whether you received a SalesPerson or Manager type, you are able to perform an explicit cast to gain access to the specialized members of the class. Also notice that you are not required to wrap your casting operations within a try/catch construct, as you know that the cast is safe if you enter either if scope, given your conditional check.

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<PrincipalPermission(SecurityAction.Demand, Role:="BUILTIN\Administrators")> _ Public Class MyWebPage Private ... End Class Again, with the previous example you have to catch the exception in the global error handler (Application_Error) because your code is not the caller of this web page. Otherwise, ASP .NET would raise the exception and display the ASP.NET error page according to the web.config configuration. The following example restricts a particular method to a specific user: <PrincipalPermission(SecurityAction.Demand, Name="FARIAMAT\matthew")> _ Private Sub DoSomething() ... End Sub The caller of this method, of course, can catch the SecurityException with a Try/Catch block. PrincipalPermission attributes give you another way to safeguard your code. You won t use them to make decisions at runtime, but you might use them to ensure that even if web.config rules are modified or circumvented, a basic level of security remains.

To wrap up this chapter, I d like to examine the details of the master parent class in the .NET platform: Object. As you were reading the previous section, you may have noticed that the base classes in your hierarchies (Car, Shape, Employee) never explicitly specify their parent classes: // Who is the parent of Car class Car {...}

Changing declarative permissions means that you need to recompile the application. But why use them if every change requires recompilation Don t you want to have the possibility of managing roles in terms of adding, deleting, and changing them Yes, and that requires more generic code, but it can t be done with declarative permissions. So, when is it helpful to use declarative permissions Well, declarative permissions are especially suited for fixed roles in your application that cannot be deleted anyway. For example, an Administrators role is required in most applications and therefore cannot be deleted. So, you can secure functionality that should be accessible to only administrators with declarative permissions. Typical examples in Windows are all the built-in groups such as Administrators, Power Users, Backup Operators, and Users.

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