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You can also choose to view the details of any of the backups by clicking the Details button. This will open the Backup Details dialog box, as shown in Figure 7-4. The Backup Details dialog box displays various useful pieces of information, such as the status, the description (Manual Backup in the example), which volumes were backed up, and which files were excluded from the backup.

The following example shows how to use the printf function. It creates a function that expects a string and then passes a string to this function. Printf.printf "Hello %s" "Robert" The results of this code are as follows:

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The System.Threading.Thread class. For more control, you can spawn a new thread at will by creating a Thread object. The Thread object is tied to a single method, which it launches when you call Thread.Start(). When the method ends, the thread is destroyed. This approach is the most powerful, but it also requires the most work to implement. These three approaches differ in how they are implemented by the CLR, how you write your code, and what features are available. A serious .NET programmer needs to be familiar with all three. In the rest of this chapter, you ll work through examples that put all three of these techniques to the test. Along the way, you ll develop a simple asynchronous application, making it increasingly more sophisticated (and more complex).

You can avoid threading concerns altogether using the System.Windows.Forms.Timer component. However, the Timer doesn t offer true multithreaded execution. Instead, it waits for an idle moment in your application, at which point it triggers the Timer.Tick event handler. The advantage of the Timer is that your time code always executes on the main user interface thread, thereby sidestepping synchronization problems and other headaches. However, this also introduces a number of limitations. For example, if your Timer event handling code performs a time-consuming task, the user interface will lock up until it s finished. Thus, the timer doesn t help you make a user interface more responsive, and it doesn t allow you to collapse the waiting time for high-latency operations. To get this functionality, you need real multithreading. .NET actually provides several different timers, some of which do execute on other threads (which also means they introduce the threading complexities you ll learn about in this chapter). You can learn more about .NET timers from an MSDN Magazine article at http://msdn.microsoft.com/msdnmag/issues/04/ 02/TimersinNET. But before you do, read through this chapter to get a handle on the essentials of multithreading and synchronization.

Figure 7-4. Viewing the details of a particular backup You can also easily turn off backups from the main Computers & Backups tab. Right-click the computer for which you want to turn off backups and select Turn Off Backups. If you select this option, backups will be switched off for that computer. You can easily switch backups back on by right-clicking the computer again and selecting Turn On Backups.

As you already know, delegates are type-safe function pointers that form the basis for .NET events. You create a delegate that references a specific method, and then you can call that method through the delegate. The first step is to define the delegate at the namespace level (if it s not already present in the .NET class library). Here s a delegate that can point to any method that accepts a single integer parameter and returns an integer: public delegate int DoSomethingDelegate(int input); Now consider a class that has a method that matches this delegate:

The significance of this might not be entirely obvious, but the following example will probably help explain it. If a parameter of the wrong type is passed to the printf function, then it will not compile: Printf.printf "Hello %s" 1 The previous code will not compile, giving the following error:

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