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Now when you call this method passing in a reference to a SafeWaitHandle object, the CLR will increment the counter just before the call and decrement the counter just after the call . Of course, the manipulation of the counter is performed in a thread-safe fashion . How does this improve security Well, if another thread tries to release the native resource wrapped by the SafeHandle object, the CLR knows that it cannot actually release it because the resource is being used by an unmanaged function . When the unmanaged function returns, the counter is decremented to 0, and the resource will be released . If you are writing or calling code to manipulate a handle as an IntPtr, you can access it out of a SafeHandle object, but you should manipulate the reference counting explicitly . You accomplish this via SafeHandle s DangerousAddRef and DangerousRelease methods . You gain access to the raw handle via the DangerousGetHandle method . I would be remiss if I didn t mention that the System.Runtime.InteropServices namespace also defines a CriticalHandle class . This class works exactly as the SafeHandle class in all ways except that it does not offer the reference-counting feature . The CriticalHandle class and the classes derived from it sacrifice security for better performance when you use it (since counters don t get manipulated) . As does SafeHandle, the CriticalHandle class has two types derived from it: CriticalHandleMinusOneIsInvalid and CriticalHandleZeroOrMinusOneIsInvalid . Since Microsoft favors a more secure system over a faster system, the class library includes no types derived from either of these two classes . For your own work, I would recommend that you use CriticalHandle-derived types only if performance is an issue . If you can justify reducing security, you can switch to a CriticalHandle-derived type .

Packets With Replay Detection Confidential Bytes Sent Confidential Bytes Received Authenticated Bytes Sent

int SomeInt = 1234567; System.Console.WriteLine(SomeInt.ToString("E2", null));

Authenticated Bytes Received Transport Bytes Sent Transport Bytes Received Bytes Sent In Tunnels Bytes Received In Tunnels Offloaded Bytes Sent Offloaded Bytes Received

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Important There are some people who are of the mindset that you should never use finalization with managed resources . For the most part, I agree with these people . Therefore, you may want to skip this section entirely . Using finalization with managed resources is a super-advanced way of coding and should be used only in very rare circumstances . You must have complete and intimate knowledge of the code you are calling from within a Finalize method . Furthermore, you must know that the behavior of code you are calling will not change with future versions . Specifically, you must know that any code you call from within a Finalize method does not use any other object that could have already been finalized .

11-38

While finalization is almost exclusively used to release a native resource, it can occasionally be useful with managed resources too . Here s a class that causes the computer to beep every time the garbage collector performs a collection:

11

The code produces the following output:

internal sealed class GCBeep { ~GCBeep() { // This is the Finalize method Console.Beep(); // If the AppDomain isn t unloading and if the process isn t shutting down, // create a new object that will get finalized at the next collection. if (!AppDomain.CurrentDomain.IsFinalizingForUnload() &&!Environment.HasShutdownStarted) new GCBeep(); } }

Netcap.exe is a command-line utility that you can use to capture network traffic to a cap ture file. You can then load the file in Network Monitor to view the captured traffic. The Network Monitor tool does not have to be installed on the computer running Windows Server 2003 to use Netcap. You can also use Netcap on computers running Windows XP, which makes it an extremely attractive way to capture traffic for later review. The tool is available after the Windows Server 2003 Support Tools have been installed. When you first run the command, the Network Monitor driver is automatically installed. Table 11-9 describes the syntax used to obtain a capture.

To use this class, you need just to construct one instance of the class . Then whenever a garbage collection occurs, the object s Finalize method is called, which calls Beep and constructs a new GCBeep object . This new GCBeep object will have its Finalize method called when the next garbage collection occurs . Here s a sample program that demonstrates the GCBeep class:

Table 11-9

As shown in this example, the ToString method of a numeric type can be called directly; more commonly, a number is formatted indirectly through one of the string formatting methods such as those provided by Console.WriteLine. When you're using the string formatting methods, it's important to understand that only the portion of the format specifier after the semicolon is passed to the ToString method of the number being formatted. For example, in the following statement:

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