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Here s what s happening. Main begins executing and calls HundredDivX, passing it 0. Inside HundredDivX, 100 is divided by 0, which causes the CLR to throw an OverflowException. (An OverflowException is thrown instead of a DivideByZeroException because Visual Basic treats the 100 as an 8 byte real number instead of an integer.) When the exception is thrown, the CLR calls the first catch filter funclet (generated by the compiler) corresponding to the first Catch block. This complex catch filter funclet checks whether the OverflowException object is derived from Exception. Because it is, the filter then asks if x is 0, by way of the Visual Basic When statement. Because this is also true, the catch filter funclet returns a value telling the CLR that it wants to handle the exception. The CLR now unwinds the stack by executing any Finally blocks farther down the call stack. In this example, there aren t any. Once all the Finally blocks have executed, execution passes to the code inside the handling Catch block. The return string is set to "Problem: x was 0"; the thread falls out of the Catch block and then out of the Try block; lastly, the thread returns from the method. Now back inside Main, HundredDivX is called again, but this time 2 is passed. Inside HundredDivX, 100 is divided by 2, which sets x to 50 without causing an exception to be thrown. But then, a, a reference to a System.Object, is declared and initialized to Nothing. Attempting to call ToString causes the CLR to throw a NullReferenceException exception. The first catch filter funclet examines the type and sees a match. But because x is now 50 (not 0), the catch filter funclet tells the CLR to continue searching.

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The CLR checks the second catch filter. Because NullReferenceException is derived from Exception and because this second catch filter has no When statement associated with it, the filter funclet returns a special value telling the CLR that it will handle the exception. Again, the CLR unwinds any Finally blocks that might exist and then passes execution to the code inside the active Catch block. This block sets the return string to "Problem: I don t know what the problem is". The thread now falls out of the Catch block, then out of the Try block, and then returns from the method. You should take away two important points from this section: The CLR supports complex filters, but many languages don t. If you re working in a language that doesn t support complex filters but you want to use one, write that part of your code in Visual Basic, IL assembly, or some other language that supports it. Because code in the various programming languages integrates seamlessly, this is a viable solution. Notice from the previous code example how the CLR manages an exception. First, the CLR locates a catch filter that accepts the exception. Then the CLR unwinds the call stack by calling Finally blocks. Finally, the CLR passes execution to the code contained inside the handling Catch block.

Requirements: The subject name in the certi cate must match the Domain Name System (DNS) name of the host that provides the certi cate. Browsers will generally check that the certi cate has a chain of trust to one of the root authorities trusted by the browser. Recommended certi cate store: LocalMachine\My Example: CN=login.adatumpharma.com

Microsoft Dynamics CRM includes many powerful features, but the ability to create custom entities, including custom activities, through a web-based administration tool ranks as one of the more important ones. By using custom entities, you can easily track additional types of information related to your customers. Custom entities behave almost exactly like the default system entities. Understanding how Microsoft Dynamics CRM structures entity relationships can help you design your system to ensure a smooth implementation. Custom activities are a special type of custom entity that allow you to create new activities that appear and function like the default system activities of phone calls, tasks, letters, emails, and faxes.

As explained in the previous section, when an exception is thrown, the CLR starts searching for a catch filter interested in handling the exception If no catch filter accepts the exception object, an unhandled exception occurs An unhandled exception identifies a situation that the application didn t anticipate When developing an application, you should set a policy for dealing with unhandled exceptions In addition, it s quite common to have one policy for debug versions of your application and a different policy for release versions Normally, in a debug version, you want the debugger to start and attach itself to your application so that you can find out exactly what went wrong and correct the code For a release version, the unhandled exception is occurring while the user is using the application The user probably doesn t have the knowledge (or the source code) to debug the application.

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