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Here you re taking the reference (or pointer) contained in element 0 of the ArrayList and trying to put it into a Point value type instance, p . For this to work, all of the fields contained in the boxed Point object must be copied into the value type variable, p, which is on the thread s stack . The CLR accomplishes this copying in two steps . First, the address of the Point fields in the boxed Point object is obtained . This process is called unboxing . Then, the values of these fields are copied from the heap to the stack-based value type instance . Unboxing is not the exact opposite of boxing . The unboxing operation is much less costly than boxing . Unboxing is really just the operation of obtaining a pointer to the raw value type (data fields) contained within an object . In effect, the pointer refers to the unboxed portion in the boxed instance . So, unlike boxing, unboxing doesn t involve the copying of any bytes in memory . Having made this important clarification, it is important to note that an unboxing operation is typically followed by copying the fields . Obviously, boxing and unboxing/copy operations hurt your application s performance in terms of both speed and memory, so you should be aware of when the compiler generates code to perform these operations automatically and try to write code that minimizes this code generation .

Domain Name System (DNS) is the single most important service in Microsoft Windows Server 2003 networks. When DNS breaks, so does the Active Directory directory service and most Internet connectivity. Because of its importance, you need to be able to monitor, diagnose, and repair DNS to ensure its proper func tioning on your network. This chapter introduces you to the tools and procedures necessary to monitor and troubleshoot DNS name resolution. These tools include the Nslookup utility, the DNS Events log, Replication Monitor, and the DNS log. Lessons in this :

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Appendix A. Platform Integration // Enable event notifications log.EnableRaisingEvents = true; // Create the event handler log.EntryWritten += new EntryWrittenEventHandler(EventLogEventHandler); // Make sure the process does not terminate Console.ReadLine(); } public static void EventLogEventHandler(object sender, EntryWrittenEventArgs arg) { // Get the EventLogEntry that triggered the event EventLogEntry entry = arg.Entry; // Display summary information for the event to // the console Console.WriteLine( "{0}:Category {1} event triggered by {2}", entry.TimeWritten, entry.CategoryNumber, entry.Source);

Internally, here s exactly what happens when a boxed value type instance is unboxed: 1. If the variable containing the reference to the boxed value type instance is null, a NullReferenceException is thrown . 2. If the reference doesn t refer to an object that is a boxed instance of the desired value type, an InvalidCastException is thrown .1 The second item above means that the following code will not work as you might expect:

Lesson 1: Using DNS Troubleshooting Tools. . . . . . . . . . . . . . . . . . . . . . . . . .6-3 Lesson 2: Using DNS Monitoring Tools. . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-20

public static Int32 x = Object o = Int16 y = } void Main() { 5; x; // Box x; o refers to the boxed object (Int16) o; // Throws an InvalidCastException

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If we run the previous EventLogWriter example while the EventLogListener example is running, we get output similar to the following:

be seen on one subnet as host1.subnet1.microsoft.com and on another as host1.subnet2.microsoft.com.

Logically, it makes sense to take the boxed Int32 that o refers to and cast it to an Int16 . However, when unboxing an object, the cast must be to the exact unboxed value type Int32 in this case . Here s the correct way to write this code:

When setting names for DNS, think of the computer or host name as the leftmost por tion of an FQDN. For example, in wkstn1.example.microsoft.com., wkstn1 is the com puter name. You can modify this computer name by using the Computer Name tab of the System Properties dialog box.

public static Int32 x = Object o = Int16 y = } void Main() { 5; x; // Box x; o refers to the boxed object (Int16)(Int32) o; // Unbox to the correct type and cast

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