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A try/catch scope may also define an optional finally block. The motivation behind a finally block is to ensure that a set of code statements will always execute, exception (of any type) or not. To illustrate, assume you wish to always power down the car s radio before exiting Main(), regardless of any handled exception: static void Main(string[] args) { ... Car myCar = new Car("Zippy", 20); myCar.CrankTunes(true); try { // Speed up car logic. } catch(CarIsDeadException e) { // Process CarIsDeadException. }

We have just a couple of small tasks left to do set the font color for the links and set a background that is going to be used for the current page: #tablinks a:link, #tablinks a:visited, #tablinks a:hover, #tablinks a:active { color:white; text-decoration:none; } #tablinks a.current { background:#047070 url(tab-bg-hover.gif) repeat-x top; } Remember to set the class of current to the appropriate link (applied to the a element, not the containing div): <div><a href="/travel/" class="current">Travel</a></div> The final result is shown in Figure 8-12.

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catch(ArgumentOutOfRangeException e) { // Process ArgumentOutOfRangeException. } catch(Exception e) { // Process any other Exception. } finally { // This will always occur. Exception or not. myCar.CrankTunes(false); } ... } If you did not include a finally block, the radio would not be turned off if an exception is encountered (which may or may not be problematic). In a more real-world scenario, when you need to dispose of objects, close a file, detach from a database (or whatever), a finally block ensures a location for proper cleanup.

For i = 1 To 3 Worksheets(1).ChartObjects(i).Activate sTitle = ActiveChart.ChartTitle.Text Set m_oPptSlide = m_oPptShow.Slides.Add(i + 1, ppLayoutTextAndChart) With m_oPptSlide.Shapes.Placeholders(1) With .TextFrame.TextRange .Text = sTitle End With End With With m_oPptSlide.Shapes.Placeholders(2) With .TextFrame.TextRange .Text = GetSubjectBody(i) End With End With Worksheets(1).ChartObjects(i).Copy Set oShape = m_oPptSlide.Shapes(3) With oShape top = .Top left = .Left width = .Width height = .Height .Delete End With With m_oPptSlide.Shapes.Paste .Top = top .Left = left .Width = width End With Next i Set oShape = Nothing End Sub

Given that a method in the .NET Framework could throw any number of exceptions (under various circumstances), a logical question would be How do I know which exceptions may be thrown by a given base class library method The ultimate answer is simple: Consult the .NET Framework 2.0 SDK documentation. Each method in the help system documents the exceptions a given member may throw. As a quick alternative, Visual Studio 2005 allows you to view the list of all exceptions thrown by a base class library member (if any) simply by hovering your mouse cursor over the member name in the code window (see Figure 6-6).

For those coming to .NET from a Java background, understand that type members are not prototyped with the set of exceptions it may throw (in other words, .NET does not support typed exceptions). Given this, you are not required to handle each and every exception thrown from a given member. In many cases, you can handle all possible errors thrown from a set scope by catching a single System.Exception: static void Main(string[] args) { try { File.Open("IDontExist.txt", FileMode.Open); } catch(Exception ex) { Console.WriteLine(ex.Message); } } However, if you do wish to handle specific exceptions uniquely, just make use of multiple catch blocks as shown throughout this chapter.

Note In the previous example it would be up to you to manually or programmatically write in the current

At this point, you might be wondering what would happen if you do not handle an exception thrown your direction. Assume that the logic in Main() increases the speed of the Car object beyond the maximum speed, without the benefit of try/catch logic. The result of ignoring an exception would be highly obstructive to the end user of your application, as an unhandled exception dialog box is displayed. On a machine where .NET debugging tools are installed, you would see something similar to Figure 6-7 (a nondevelopment machine would display a similar intrusive dialog box).

To wrap things up, do be aware that Visual Studio 2005 provides a number of tools that help you debug unhandled custom exceptions. Again, assume you have increased the speed of a Car object beyond the maximum. If you were to start a debugging session (using the Debug Start menu selection), Visual Studio automatically breaks at the time the uncaught exception is thrown. Better yet, you are presented with a window (see Figure 6-8) displaying the value of the Message property.

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