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Dan Appleman

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By now most of you reading this article will be familiar with .NET exception handling, at least in its basic form. You know how to catch exceptions using Try...Catch blocks. You know how to handle exceptions raised by the framework. You may even have created and thrown your own exceptions. In this article you'll learn how to take this to the next level - how to define custom exceptions for your own classes and components, and the design patterns that you should use when doing so. I have included two sample projects to help explain these design patterns. The SampleComponent project contains the MyComponent component, which raises a variety of exceptions. The project also includes a couple of custom exception classes that you'll learn about later in this article. The component represents any generic component or reusable class. If you have no interest in components or ... (more)

Testing Code Access Security

One of the most serious flaws of COM and API-based software development is that once you allow a component to run on your system, it has unrestricted permission to do anything. That's why viruses are such a problem - once they are on your system, there is little to protect you from their actions. With .NET, Microsoft has introduced something called code access security (CAS). Code access security allows fine-grained control over what code is allowed to do. For example: .NET software downloaded from the Internet can't make API calls, can't access your registry - can't even read and... (more)