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Be aware that it is permissible for logic in a try block to rethrow an exception up the call stack to the previous caller. To do so, simply make use of the throw keyword within a catch block. This passes the exception up the chain of calling logic, which can be helpful if your catch block is only able to partially handle the error at hand: // Passing the buck. static void Main(string[] args) { ... try { // Speed up car logic... } catch(CarIsDeadException e) { // Do any partial processing of this error and pass the buck. // Here, we are rethrowing the incoming CarIsDeadException object. // However, you are also free to throw a different exception if need be. throw e; } ... } Be aware that in this example code, the ultimate receiver of CarIsDeadException is the CLR, given that it is the Main() method rethrowing the exception. Given this point, your end user is presented with a system-supplied error dialog box. Typically, you would only rethrow a partial handled exception to a caller that has the ability to handle the incoming exception more gracefully.

As you may suspect, it is entirely possible to trigger an exception at the time you are handling another exception. For example, assume that you are handing a CarIsDeadException within a particular catch scope, and during the process you attempt to record the stack trace to a file on your C drive named carErrors.txt: catch(CarIsDeadException e) { // Attempt to open a file named carErrors.txt on the C drive. FileStream fs = File.Open(@"C:\carErrors.txt", FileMode.Open); ... }

promoting the inline a element to a block element, you could float them, apply padding and margins and so on to get the same effect. However, if you have total control over the HTML for these navigation blocks, you would be wise to put them in an unordered list, as previously noted.

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Now, if the specified file is not located on your C drive, the call to FileOpen() results in a FileNotFoundException! Later in this text, you will learn all about the SystemIO namespace where you will discover how to programmatically determine if a file exists on the hard drive before attempting to open the file in the first place (thereby avoiding the exception altogether) However, to keep focused on the topic of exceptions, assume the exception has been raised When you encounter an exception while processing another exception, best practice states that you should record the new exception object as an inner exception within a new object of the same type as the initial exception (that was a mouthful) The reason we need to allocate a new object of the exception being handled is that the only way to document an inner exception is via a constructor parameter.

Listing 8-12. Complete CreateChartSlidesText Subroutine Sub Dim Dim Dim Dim Dim Dim Dim CreateChartSlidesText() i As Integer sTitle As String oShape As PowerPoint.Shape top As Integer left As Integer height As Integer width As Integer

Consider the following code: catch (CarIsDeadException e) { try { FileStream fs = FileOpen(@"C:\carErrorstxt", FileModeOpen); .. } catch (Exception e2) { // Throw a exception that records the new exception, // as well as the message of the first exception throw new CarIsDeadException(eMessage, e2); } } Notice in this case, we have passed in the FileNotFoundException object as the second parameter to the CarIsDeadException constructor Once we have configured this new object, we throw it up the call stack to the next caller, which in this case would be the Main() method Given that there is no next caller after Main() to catch the exception, we would be again presented with an error dialog box Much like the act of rethrowing an exception, recording inner exceptions is usually only useful when the caller has the ability to gracefully catch the exception in the first place.

If this is the case, the caller s catch logic can make use of the InnerException property to extract the details of the inner exception object..

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